1211220200220 has 96 divisors (see below), whose sum is σ = 3411112461120. Its totient is φ = 321120307200.

The previous prime is 1211220200213. The next prime is 1211220200221. The reversal of 1211220200220 is 220020221121.

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 1211220200220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220200221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9568864 + ... + 9694616.

It is an arithmetic number, because the mean of its divisors is an integer number (35532421470).

Almost surely, 2^{1211220200220} is an apocalyptic number.

1211220200220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211220200220 is an abundant number, since it is smaller than the sum of its proper divisors (2199892260900).

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

1211220200220 is a wasteful number, since it uses less digits than its factorization.

1211220200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126695 (or 126693 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1211220200220 its reverse (220020221121), we get a palindrome (1431240421341).

The spelling of 1211220200220 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred thousand, two hundred twenty".