21704774 has 32 divisors (see below), whose sum is σ = 41373696. Its totient is φ = 8307360.

The previous prime is 21704737. The next prime is 21704791. The reversal of 21704774 is 47740712.

21704774 is a modest number, since divided by 4774 gives 2170 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 21704774.

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, 3719 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (1292928).

Almost surely, 2^21704774 is an apocalyptic number.

21704774 is a deficient number, since it is larger than the sum of its proper divisors (19668922).

21704774 is a wasteful number, since it uses less digits than its factorization.

21704774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 21704774 is about 4658.8382672078. The cubic root of 21704774 is about 278.9448981850.

The spelling of 21704774 in words is "twenty-one million, seven hundred four thousand, seven hundred seventy-four".