21560790 has 32 divisors (see below), whose sum is σ = 52162560. Its totient is φ = 5703264.

The previous prime is 21560789. The next prime is 21560809. The reversal of 21560790 is 9706512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 981 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (1630080).

Almost surely, 2^21560790 is an apocalyptic number.

21560790 is an abundant number, since it is smaller than the sum of its proper divisors (30601770).

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

21560790 is a wasteful number, since it uses less digits than its factorization.

21560790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796.

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

The square root of 21560790 is about 4643.3597749905. The cubic root of 21560790 is about 278.3267124851.

The spelling of 21560790 in words is "twenty-one million, five hundred sixty thousand, seven hundred ninety".