121551553992 has 64 divisors (see below), whose sum is σ = 331710163200. Its totient is φ = 36810923840.

The previous prime is 121551553973. The next prime is 121551554011. The reversal of 121551553992 is 299355155121.

It is an interprime number because it is at equal distance from previous prime (121551553973) and next prime (121551554011).

It is a super-2 number, since 2×121551553992² (a number of 23 digits) contains 22 as substring.

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, 285223 + ... + 569609.

It is an arithmetic number, because the mean of its divisors is an integer number (5182971300).

Almost surely, 2^121551553992 is an apocalyptic number.

121551553992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121551553992 is an abundant number, since it is smaller than the sum of its proper divisors (210158609208).

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

121551553992 is a wasteful number, since it uses less digits than its factorization.

121551553992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286026 (or 286022 counting only the distinct ones).

The product of its digits is 607500, while the sum is 48.

The spelling of 121551553992 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred fifty-three thousand, nine hundred ninety-two".