121555272680 has 32 divisors (see below), whose sum is σ = 280891241640. Its totient is φ = 47307997440.

The previous prime is 121555272673. The next prime is 121555272697. The reversal of 121555272680 is 86272555121.

It can be written as a sum of positive squares in 4 ways, for example, as 120252207076 + 1303065604 = 346774^2 + 36098^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41064491 + ... + 41067450.

Almost surely, 2^121555272680 is an apocalyptic number.

121555272680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121555272680 is an abundant number, since it is smaller than the sum of its proper divisors (159335968960).

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

121555272680 is a wasteful number, since it uses less digits than its factorization.

121555272680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82131989 (or 82131985 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 44.

The spelling of 121555272680 in words is "one hundred twenty-one billion, five hundred fifty-five million, two hundred seventy-two thousand, six hundred eighty".