13420971 has 20 divisors (see below), whose sum is σ = 20356072. Its totient is φ = 8810208.

The previous prime is 13420961. The next prime is 13420987. The reversal of 13420971 is 17902431.

It is not a de Polignac number, because 13420971 - 2²² = 9226667 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13420961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4191 + ... + 6663.

Almost surely, 2^13420971 is an apocalyptic number.

13420971 is a deficient number, since it is larger than the sum of its proper divisors (6935101).

13420971 is an equidigital number, since it uses as much as digits as its factorization.

13420971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552 (or 2543 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 13420971 is about 3663.4643440328. The cubic root of 13420971 is about 237.6446158947.

The spelling of 13420971 in words is "thirteen million, four hundred twenty thousand, nine hundred seventy-one".