21730774 has 16 divisors (see below), whose sum is σ = 35501760. Its totient is φ = 9915840.

The previous prime is 21730769. The next prime is 21730799. The reversal of 21730774 is 47703712.

It is a congruent number.

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, 2382 + ... + 7009.

It is an arithmetic number, because the mean of its divisors is an integer number (2218860).

Almost surely, 2^21730774 is an apocalyptic number.

21730774 is a deficient number, since it is larger than the sum of its proper divisors (13770986).

21730774 is a wasteful number, since it uses less digits than its factorization.

21730774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9495.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 21730774 is about 4661.6278272724. The cubic root of 21730774 is about 279.0562358005.

The spelling of 21730774 in words is "twenty-one million, seven hundred thirty thousand, seven hundred seventy-four".