1210111101220 has 96 divisors (see below), whose sum is σ = 3035706605568. Its totient is φ = 396179617152.

The previous prime is 1210111101191. The next prime is 1210111101223. The reversal of 1210111101220 is 221011110121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210111101220.

It is not an unprimeable number, because it can be changed into a prime (1210111101223) 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, 1570029 + ... + 2210251.

It is an arithmetic number, because the mean of its divisors is an integer number (31621943808).

Almost surely, 2^{1210111101220} is an apocalyptic number.

1210111101220 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 1210111101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1517853302784).

1210111101220 is an abundant number, since it is smaller than the sum of its proper divisors (1825595504348).

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

1210111101220 is a wasteful number, since it uses less digits than its factorization.

1210111101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640849 (or 640847 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210111101220 its reverse (221011110121), we get a palindrome (1431122211341).

The spelling of 1210111101220 in words is "one trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, two hundred twenty".