13213971 has 6 divisors (see below), whose sum is σ = 19086860. Its totient is φ = 8809308.

The previous prime is 13213951. The next prime is 13213979. The reversal of 13213971 is 17931231.

It is not a de Polignac number, because 13213971 - 2⁵ = 13213939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13213979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 734101 + ... + 734118.

Almost surely, 2^13213971 is an apocalyptic number.

13213971 is a deficient number, since it is larger than the sum of its proper divisors (5872889).

13213971 is a wasteful number, since it uses less digits than its factorization.

13213971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468225 (or 1468222 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 13213971 is about 3635.1026120317. The cubic root of 13213971 is about 236.4164997459.

The spelling of 13213971 in words is "thirteen million, two hundred thirteen thousand, nine hundred seventy-one".