13965021 has 32 divisors (see below), whose sum is σ = 24295680. Its totient is φ = 7760448.

The previous prime is 13964989. The next prime is 13965053. The reversal of 13965021 is 12056931.

13965021 is a `hidden beast` number, since 1 + 3 + 9 + 650 + 2 + 1 = 666.

13965021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13964989) and next prime (13965053).

It is not a de Polignac number, because 13965021 - 2⁵ = 13964989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13965521) 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, 5995 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (759240).

Almost surely, 2^13965021 is an apocalyptic number.

It is an amenable number.

13965021 is a deficient number, since it is larger than the sum of its proper divisors (10330659).

13965021 is a wasteful number, since it uses less digits than its factorization.

13965021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050 (or 2044 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 13965021 is about 3736.9801979673. The cubic root of 13965021 is about 240.8133343333.

The spelling of 13965021 in words is "thirteen million, nine hundred sixty-five thousand, twenty-one".