13056921 has 24 divisors (see below), whose sum is σ = 19858176. Its totient is φ = 8255520.

The previous prime is 13056919. The next prime is 13056937. The reversal of 13056921 is 12965031.

It is not a de Polignac number, because 13056921 - 2¹ = 13056919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13056941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14346 + ... + 15228.

It is an arithmetic number, because the mean of its divisors is an integer number (827424).

Almost surely, 2^13056921 is an apocalyptic number.

It is an amenable number.

13056921 is a deficient number, since it is larger than the sum of its proper divisors (6801255).

13056921 is a wasteful number, since it uses less digits than its factorization.

13056921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 970 counting only the distinct ones).

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

The square root of 13056921 is about 3613.4361762732. The cubic root of 13056921 is about 235.4761494231.

The spelling of 13056921 in words is "thirteen million, fifty-six thousand, nine hundred twenty-one".