21870874 has 24 divisors (see below), whose sum is σ = 35558460. Its totient is φ = 10053888.

The previous prime is 21870869. The next prime is 21870883. The reversal of 21870874 is 47807812.

It can be written as a sum of positive squares in 6 ways, for example, as 21390625 + 480249 = 4625^2 + 693^2 .

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 11 ways as a sum of consecutive naturals, for example, 95392 + ... + 95620.

Almost surely, 2^21870874 is an apocalyptic number.

21870874 is a deficient number, since it is larger than the sum of its proper divisors (13687586).

21870874 is a wasteful number, since it uses less digits than its factorization.

21870874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 21870874 is about 4676.6306247126. The cubic root of 21870874 is about 279.6546507554.

The spelling of 21870874 in words is "twenty-one million, eight hundred seventy thousand, eight hundred seventy-four".