21970413 has 16 divisors (see below), whose sum is σ = 33600000. Its totient is φ = 14173920.

The previous prime is 21970397. The next prime is 21970427. The reversal of 21970413 is 31407912.

It is not a de Polignac number, because 21970413 - 2⁴ = 21970397 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21970433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12288 + ... + 13961.

It is an arithmetic number, because the mean of its divisors is an integer number (2100000).

Almost surely, 2^21970413 is an apocalyptic number.

It is an amenable number.

21970413 is a deficient number, since it is larger than the sum of its proper divisors (11629587).

21970413 is a wasteful number, since it uses less digits than its factorization.

21970413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26289 (or 26283 counting only the distinct ones).

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

The square root of 21970413 is about 4687.2607138925. The cubic root of 21970413 is about 280.0782646863.

The spelling of 21970413 in words is "twenty-one million, nine hundred seventy thousand, four hundred thirteen".