121210112220 has 96 divisors (see below), whose sum is σ = 356079876096. Its totient is φ = 30767212800.

The previous prime is 121210112213. The next prime is 121210112327. The reversal of 121210112220 is 22211012121.

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 121210112220.

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 31 ways as a sum of consecutive naturals, for example, 420694 + ... + 647613.

It is an arithmetic number, because the mean of its divisors is an integer number (3709165376).

Almost surely, 2^121210112220 is an apocalyptic number.

121210112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210112220 is an abundant number, since it is smaller than the sum of its proper divisors (234869763876).

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

121210112220 is a wasteful number, since it uses less digits than its factorization.

121210112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068411 (or 1068409 counting only the distinct ones).

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

Adding to 121210112220 its reverse (22211012121), we get a palindrome (143421124341).

The spelling of 121210112220 in words is "one hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, two hundred twenty".