13976999421 has 64 divisors (see below), whose sum is σ = 24295403520. Its totient is φ = 6943696320.

The previous prime is 13976999383. The next prime is 13976999447. The reversal of 13976999421 is 12499967931.

It is a happy number.

It is not a de Polignac number, because 13976999421 - 2⁹ = 13976998909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13976999461) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2808091 + ... + 2813063.

It is an arithmetic number, because the mean of its divisors is an integer number (379615680).

Almost surely, 2^13976999421 is an apocalyptic number.

13976999421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13976999421 is a deficient number, since it is larger than the sum of its proper divisors (10318404099).

13976999421 is an equidigital number, since it uses as much as digits as its factorization.

13976999421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5063 (or 5017 counting only the distinct ones).

The product of its digits is 6613488, while the sum is 60.

The spelling of 13976999421 in words is "thirteen billion, nine hundred seventy-six million, nine hundred ninety-nine thousand, four hundred twenty-one".