21875770 has 64 divisors (see below), whose sum is σ = 49268736. Its totient is φ = 6819840.

The previous prime is 21875767. The next prime is 21875797. The reversal of 21875770 is 7757812.

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 31 ways as a sum of consecutive naturals, for example, 36594 + ... + 37186.

It is an arithmetic number, because the mean of its divisors is an integer number (769824).

Almost surely, 2^21875770 is an apocalyptic number.

21875770 is an abundant number, since it is smaller than the sum of its proper divisors (27392966).

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

21875770 is a wasteful number, since it uses less digits than its factorization.

21875770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 21875770 is about 4677.1540492056. The cubic root of 21875770 is about 279.6755169694.

The spelling of 21875770 in words is "twenty-one million, eight hundred seventy-five thousand, seven hundred seventy".