139604713921 has 4 divisors (see below), whose sum is σ = 139608751572. Its totient is φ = 139600676272.

The previous prime is 139604713907. The next prime is 139604713931. The reversal of 139604713921 is 129317406931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105001273521 + 34603440400 = 324039^2 + 186020^2 .

It is a cyclic number.

It is not a de Polignac number, because 139604713921 - 2³⁷ = 2165760449 is a prime.

It is a super-2 number, since 2×139604713921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139604713931) 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 3 ways as a sum of consecutive naturals, for example, 1966510 + ... + 2036263.

It is an arithmetic number, because the mean of its divisors is an integer number (34902187893).

Almost surely, 2^139604713921 is an apocalyptic number.

It is an amenable number.

139604713921 is a deficient number, since it is larger than the sum of its proper divisors (4037651).

139604713921 is an equidigital number, since it uses as much as digits as its factorization.

139604713921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037650.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 139604713921 in words is "one hundred thirty-nine billion, six hundred four million, seven hundred thirteen thousand, nine hundred twenty-one".