21875450 has 12 divisors (see below), whose sum is σ = 40688430. Its totient is φ = 8750160.

The previous prime is 21875443. The next prime is 21875453. The reversal of 21875450 is 5457812.

It can be written as a sum of positive squares in 3 ways, for example, as 17048641 + 4826809 = 4129^2 + 2197^2 .

It is not an unprimeable number, because it can be changed into a prime (21875453) 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, 218705 + ... + 218804.

Almost surely, 2^21875450 is an apocalyptic number.

21875450 is a deficient number, since it is larger than the sum of its proper divisors (18812980).

21875450 is a wasteful number, since it uses less digits than its factorization.

21875450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437521 (or 437516 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 21875450 is about 4677.1198402436. The cubic root of 21875450 is about 279.6741532597.

The spelling of 21875450 in words is "twenty-one million, eight hundred seventy-five thousand, four hundred fifty".