139857137421 has 16 divisors (see below), whose sum is σ = 192228076800. Its totient is φ = 90380881728.

The previous prime is 139857137393. The next prime is 139857137443. The reversal of 139857137421 is 124731758931.

It is not a de Polignac number, because 139857137421 - 2¹¹ = 139857135373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139857137821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2312101 + ... + 2371818.

It is an arithmetic number, because the mean of its divisors is an integer number (12014254800).

Almost surely, 2^139857137421 is an apocalyptic number.

It is an amenable number.

139857137421 is a deficient number, since it is larger than the sum of its proper divisors (52370939379).

139857137421 is a wasteful number, since it uses less digits than its factorization.

139857137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684228.

The product of its digits is 1270080, while the sum is 51.

The spelling of 139857137421 in words is "one hundred thirty-nine billion, eight hundred fifty-seven million, one hundred thirty-seven thousand, four hundred twenty-one".