21970564 has 24 divisors (see below), whose sum is σ = 47936448. Its totient is φ = 8559840.

The previous prime is 21970513. The next prime is 21970577. The reversal of 21970564 is 46507912.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 35359 + ... + 35974.

It is an arithmetic number, because the mean of its divisors is an integer number (1997352).

Almost surely, 2^21970564 is an apocalyptic number.

It is an amenable number.

21970564 is an abundant number, since it is smaller than the sum of its proper divisors (25965884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21970564 is a wasteful number, since it uses less digits than its factorization.

21970564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71355 (or 71353 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21970564 is about 4687.2768213537. The cubic root of 21970564 is about 280.0789063329.

The spelling of 21970564 in words is "twenty-one million, nine hundred seventy thousand, five hundred sixty-four".