139816554921 has 32 divisors (see below), whose sum is σ = 207813427200. Its totient is φ = 92906508240.

The previous prime is 139816554869. The next prime is 139816554923. The reversal of 139816554921 is 129455618931.

139816554921 is a `hidden beast` number, since 1 + 3 + 9 + 81 + 6 + 554 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 139816554921 - 2³⁴ = 122636685737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139816554923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11776030 + ... + 11787896.

It is an arithmetic number, because the mean of its divisors is an integer number (6494169600).

Almost surely, 2^139816554921 is an apocalyptic number.

It is an amenable number.

139816554921 is a deficient number, since it is larger than the sum of its proper divisors (67996872279).

139816554921 is a wasteful number, since it uses less digits than its factorization.

139816554921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13266 (or 13260 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The spelling of 139816554921 in words is "one hundred thirty-nine billion, eight hundred sixteen million, five hundred fifty-four thousand, nine hundred twenty-one".