21055474 has 16 divisors (see below), whose sum is σ = 34525440. Its totient is φ = 9550960.

The previous prime is 21055471. The next prime is 21055501. The reversal of 21055474 is 47455012.

It is not an unprimeable number, because it can be changed into a prime (21055471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18432 + ... + 19540.

It is an arithmetic number, because the mean of its divisors is an integer number (2157840).

Almost surely, 2^21055474 is an apocalyptic number.

21055474 is a deficient number, since it is larger than the sum of its proper divisors (13469966).

21055474 is a wasteful number, since it uses less digits than its factorization.

21055474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 21055474 is about 4588.6244126099. The cubic root of 21055474 is about 276.1351382601.

The spelling of 21055474 in words is "twenty-one million, fifty-five thousand, four hundred seventy-four".