21925874 has 4 divisors (see below), whose sum is σ = 32888814. Its totient is φ = 10962936.

The previous prime is 21925853. The next prime is 21925879. The reversal of 21925874 is 47852912.

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., 11730625 + 10195249 = 3425^2 + 3193^2 .

It is not an unprimeable number, because it can be changed into a prime (21925879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5481467 + ... + 5481470.

Almost surely, 2^21925874 is an apocalyptic number.

21925874 is a deficient number, since it is larger than the sum of its proper divisors (10962940).

21925874 is a wasteful number, since it uses less digits than its factorization.

21925874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10962939.

The product of its digits is 40320, while the sum is 38.

The square root of 21925874 is about 4682.5072343778. The cubic root of 21925874 is about 279.8888759719. Note that the first 4 decimals are identical.

The spelling of 21925874 in words is "twenty-one million, nine hundred twenty-five thousand, eight hundred seventy-four".