13356021 has 16 divisors (see below), whose sum is σ = 20404224. Its totient is φ = 7612464.

The previous prime is 13356017. The next prime is 13356029. The reversal of 13356021 is 12065331.

It is not a de Polignac number, because 13356021 - 2² = 13356017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13356029) 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, 13096 + ... + 14078.

It is an arithmetic number, because the mean of its divisors is an integer number (1275264).

Almost surely, 2^13356021 is an apocalyptic number.

It is an amenable number.

13356021 is a deficient number, since it is larger than the sum of its proper divisors (7048203).

13356021 is an equidigital number, since it uses as much as digits as its factorization.

13356021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 13356021 is about 3654.5890329831. The cubic root of 13356021 is about 237.2606401025.

The spelling of 13356021 in words is "thirteen million, three hundred fifty-six thousand, twenty-one".