21873476 has 24 divisors (see below), whose sum is σ = 39701760. Its totient is φ = 10533600.

The previous prime is 21873451. The next prime is 21873497. The reversal of 21873476 is 67437812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51746 + ... + 52166.

It is an arithmetic number, because the mean of its divisors is an integer number (1654240).

Almost surely, 2^21873476 is an apocalyptic number.

It is an amenable number.

21873476 is a deficient number, since it is larger than the sum of its proper divisors (17828284).

21873476 is a wasteful number, since it uses less digits than its factorization.

21873476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 873 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 21873476 is about 4676.9088081766. The cubic root of 21873476 is about 279.6657405811.

The spelling of 21873476 in words is "twenty-one million, eight hundred seventy-three thousand, four hundred seventy-six".