121211021010120 has 64 divisors (see below), whose sum is σ = 363644233600320. Its totient is φ = 32321945996544.

The previous prime is 121211021010119. The next prime is 121211021010187. The reversal of 121211021010120 is 21010120112121.

It is a happy number.

It is a super-2 number, since 2×121211021010120² (a number of 29 digits) contains 22 as substring.

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 121211021010120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11587947 + ... + 19408826.

It is an arithmetic number, because the mean of its divisors is an integer number (5681941150005).

Almost surely, 2^{121211021010120} is an apocalyptic number.

121211021010120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211021010120 is an abundant number, since it is smaller than the sum of its proper divisors (242433212590200).

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

121211021010120 is a wasteful number, since it uses less digits than its factorization.

121211021010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31029374 (or 31029370 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211021010120 its reverse (21010120112121), we get a palindrome (142221141122241).

The spelling of 121211021010120 in words is "one hundred twenty-one trillion, two hundred eleven billion, twenty-one million, ten thousand, one hundred twenty".