121956285997924 has 27 divisors (see below), whose sum is σ = 248268468375417. Its totient is φ = 52266913453104.

The previous prime is 121956285997921. The next prime is 121956285997957. The reversal of 121956285997924 is 429799582659121.

The square root of 121956285997924 is 11043382.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 802941444900 + 121153344553024 = 896070^2 + 11006968^2 .

It is not an unprimeable number, because it can be changed into a prime (121956285997921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 154212942 + ... + 155001754.

Almost surely, 2^{121956285997924} is an apocalyptic number.

121956285997924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121956285997924 is the 11043382-nd square number.

It is an amenable number.

121956285997924 is an abundant number, since it is smaller than the sum of its proper divisors (126312182377493).

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

121956285997924 is an frugal number, since it uses more digits than its factorization.

121956285997924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577644 (or 788822 counting only the distinct ones).

The product of its digits is 1763596800, while the sum is 79.

The spelling of 121956285997924 in words is "one hundred twenty-one trillion, nine hundred fifty-six billion, two hundred eighty-five million, nine hundred ninety-seven thousand, nine hundred twenty-four".