21970560 has 64 divisors (see below), whose sum is σ = 70037280. Its totient is φ = 5858304.

The previous prime is 21970513. The next prime is 21970577. The reversal of 21970560 is 6507912.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3802 + ... + 7641.

Almost surely, 2^21970560 is an apocalyptic number.

21970560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21970560 is an abundant number, since it is smaller than the sum of its proper divisors (48066720).

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

21970560 is a wasteful number, since it uses less digits than its factorization.

21970560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11465 (or 11453 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 21970560 is about 4687.2763946667. The cubic root of 21970560 is about 280.0788893357.

The spelling of 21970560 in words is "twenty-one million, nine hundred seventy thousand, five hundred sixty".