21700474 has 4 divisors (see below), whose sum is σ = 32550714. Its totient is φ = 10850236.

The previous prime is 21700409. The next prime is 21700493. The reversal of 21700474 is 47400712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 9345249 = 3515^2 + 3057^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5425117 + ... + 5425120.

Almost surely, 2^21700474 is an apocalyptic number.

21700474 is a deficient number, since it is larger than the sum of its proper divisors (10850240).

21700474 is a wasteful number, since it uses less digits than its factorization.

21700474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10850239.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 21700474 is about 4658.3767559097. The cubic root of 21700474 is about 278.9264760892.

The spelling of 21700474 in words is "twenty-one million, seven hundred thousand, four hundred seventy-four".