121021211121210 has 24 divisors (see below), whose sum is σ = 314655148915380. Its totient is φ = 32272322965632.

The previous prime is 121021211121193. The next prime is 121021211121241. The reversal of 121021211121210 is 12121112120121.

It is a happy number.

121021211121210 is a `hidden beast` number, since 1 + 210 + 2 + 121 + 1 + 121 + 210 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 119363119667649 + 1658091453561 = 10925343^2 + 1287669^2 .

It is a super-2 number, since 2×121021211121210² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 672340061695 + ... + 672340061874.

Almost surely, 2^{121021211121210} is an apocalyptic number.

121021211121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121021211121210 is an abundant number, since it is smaller than the sum of its proper divisors (193633937794170).

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

121021211121210 is a wasteful number, since it uses less digits than its factorization.

121021211121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344680123582 (or 1344680123579 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121021211121210 its reverse (12121112120121), we get a palindrome (133142323241331).

The spelling of 121021211121210 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred ten".