21925850 has 12 divisors (see below), whose sum is σ = 40782174. Its totient is φ = 8770320.

The previous prime is 21925837. The next prime is 21925853. The reversal of 21925850 is 5852912.

It can be written as a sum of positive squares in 3 ways, for example, as 9102289 + 12823561 = 3017^2 + 3581^2 .

It is not an unprimeable number, because it can be changed into a prime (21925853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219209 + ... + 219308.

Almost surely, 2^21925850 is an apocalyptic number.

21925850 is a deficient number, since it is larger than the sum of its proper divisors (18856324).

21925850 is a wasteful number, since it uses less digits than its factorization.

21925850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438529 (or 438524 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 21925850 is about 4682.5046716474. The cubic root of 21925850 is about 279.8887738500. Note that the first 3 decimals are identical.

It can be divided in two parts, 2 and 1925850, that multiplied together give a triangular number (3851700 = T₂₇₇₅).

The spelling of 21925850 in words is "twenty-one million, nine hundred twenty-five thousand, eight hundred fifty".