21745874 has 16 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 10571568.

The previous prime is 21745799. The next prime is 21745901. The reversal of 21745874 is 47854712.

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, 24767 + ... + 25629.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^21745874 is an apocalyptic number.

21745874 is a deficient number, since it is larger than the sum of its proper divisors (11784238).

21745874 is a wasteful number, since it uses less digits than its factorization.

21745874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201.

The product of its digits is 62720, while the sum is 38.

The square root of 21745874 is about 4663.2471519318. The cubic root of 21745874 is about 279.1208565014.

The spelling of 21745874 in words is "twenty-one million, seven hundred forty-five thousand, eight hundred seventy-four".