13977021 has 16 divisors (see below), whose sum is σ = 19283264. Its totient is φ = 8999424.

The previous prime is 13977017. The next prime is 13977037. The reversal of 13977021 is 12077931.

It is not a de Polignac number, because 13977021 - 2² = 13977017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13977021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13977011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11955 + ... + 13071.

It is an arithmetic number, because the mean of its divisors is an integer number (1205204).

Almost surely, 2^13977021 is an apocalyptic number.

It is an amenable number.

13977021 is a deficient number, since it is larger than the sum of its proper divisors (5306243).

13977021 is a wasteful number, since it uses less digits than its factorization.

13977021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 13977021 is about 3738.5854276718. The cubic root of 13977021 is about 240.8822907326.

The spelling of 13977021 in words is "thirteen million, nine hundred seventy-seven thousand, twenty-one".