21560774 has 4 divisors (see below), whose sum is σ = 32341164. Its totient is φ = 10780386.

The previous prime is 21560767. The next prime is 21560789. The reversal of 21560774 is 47706512.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21560774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5390192 + ... + 5390195.

It is an arithmetic number, because the mean of its divisors is an integer number (8085291).

Almost surely, 2^21560774 is an apocalyptic number.

21560774 is a deficient number, since it is larger than the sum of its proper divisors (10780390).

21560774 is a wasteful number, since it uses less digits than its factorization.

21560774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10780389.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21560774 is about 4643.3580520998. The cubic root of 21560774 is about 278.3266436374.

The spelling of 21560774 in words is "twenty-one million, five hundred sixty thousand, seven hundred seventy-four".