21930850 has 24 divisors (see below), whose sum is σ = 43192548. Its totient is φ = 8256000.

The previous prime is 21930809. The next prime is 21930851. The reversal of 21930850 is 5803912.

It can be written as a sum of positive squares in 6 ways, for example, as 11309769 + 10621081 = 3363^2 + 3259^2 .

It is not an unprimeable number, because it can be changed into a prime (21930851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12051 + ... + 13750.

Almost surely, 2^21930850 is an apocalyptic number.

21930850 is a deficient number, since it is larger than the sum of its proper divisors (21261698).

21930850 is a wasteful number, since it uses less digits than its factorization.

21930850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25830 (or 25825 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21930850 is about 4683.0385435100. The cubic root of 21930850 is about 279.9100476358.

The spelling of 21930850 in words is "twenty-one million, nine hundred thirty thousand, eight hundred fifty".