1211201120220 has 384 divisors, whose sum is σ = 4459271577600. Its totient is φ = 238485316608.

The previous prime is 1211201120203. The next prime is 1211201120237. The reversal of 1211201120220 is 220211021121.

It is an interprime number because it is at equal distance from previous prime (1211201120203) and next prime (1211201120237).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1211201120220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6863451 + ... + 7037709.

It is an arithmetic number, because the mean of its divisors is an integer number (11612686400).

Almost surely, 2^{1211201120220} is an apocalyptic number.

1211201120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211201120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2229635788800).

1211201120220 is an abundant number, since it is smaller than the sum of its proper divisors (3248070457380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211201120220 is a wasteful number, since it uses less digits than its factorization.

1211201120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174377 (or 174375 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211201120220 its reverse (220211021121), we get a palindrome (1431412141341).

Subtracting from 1211201120220 its reverse (220211021121), we obtain a palindrome (990990099099).

The spelling of 1211201120220 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred twenty thousand, two hundred twenty".