13938834021 has 32 divisors (see below), whose sum is σ = 23265066240. Its totient is φ = 7238009856.

The previous prime is 13938833981. The next prime is 13938834037. The reversal of 13938834021 is 12043883931.

It is not a de Polignac number, because 13938834021 - 2²³ = 13930445413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13938834061) 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, 662826 + ... + 683531.

It is an arithmetic number, because the mean of its divisors is an integer number (727033320).

Almost surely, 2^13938834021 is an apocalyptic number.

It is an amenable number.

13938834021 is a deficient number, since it is larger than the sum of its proper divisors (9326232219).

13938834021 is a wasteful number, since it uses less digits than its factorization.

13938834021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346413.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 13938834021 in words is "thirteen billion, nine hundred thirty-eight million, eight hundred thirty-four thousand, twenty-one".