21747474 has 48 divisors (see below), whose sum is σ = 56224800. Its totient is φ = 6212808.

The previous prime is 21747449. The next prime is 21747493. The reversal of 21747474 is 47474712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1464 + ... + 6755.

It is an arithmetic number, because the mean of its divisors is an integer number (1171350).

Almost surely, 2^21747474 is an apocalyptic number.

21747474 is an abundant number, since it is smaller than the sum of its proper divisors (34477326).

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

21747474 is a wasteful number, since it uses less digits than its factorization.

21747474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8244 (or 8231 counting only the distinct ones).

The product of its digits is 43904, while the sum is 36.

The square root of 21747474 is about 4663.4187030547. The cubic root of 21747474 is about 279.1277019749.

The spelling of 21747474 in words is "twenty-one million, seven hundred forty-seven thousand, four hundred seventy-four".