13266021 has 16 divisors (see below), whose sum is σ = 18446400. Its totient is φ = 8469888.

The previous prime is 13266007. The next prime is 13266023. The reversal of 13266021 is 12066231.

It is a happy number.

13266021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13266021 - 2⁶ = 13265957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13266023) 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, 11545 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (1152900).

Almost surely, 2^13266021 is an apocalyptic number.

It is an amenable number.

13266021 is a deficient number, since it is larger than the sum of its proper divisors (5180379).

13266021 is a wasteful number, since it uses less digits than its factorization.

13266021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 13266021 is about 3642.2549334169. The cubic root of 13266021 is about 236.7265089256.

The spelling of 13266021 in words is "thirteen million, two hundred sixty-six thousand, twenty-one".