21933610 has 12 divisors (see below), whose sum is σ = 39507174. Its totient is φ = 8767520.

The previous prime is 21933607. The next prime is 21933623. The reversal of 21933610 is 1633912.

It can be written as a sum of positive squares in 3 ways, for example, as 16216729 + 5716881 = 4027^2 + 2391^2 .

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 5 ways as a sum of consecutive naturals, for example, 14070 + ... + 15550.

Almost surely, 2^21933610 is an apocalyptic number.

21933610 is a deficient number, since it is larger than the sum of its proper divisors (17573564).

21933610 is an frugal number, since it uses more digits than its factorization.

21933610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 21933610 is about 4683.3332147094. Note that the first 3 decimals coincide. The cubic root of 21933610 is about 279.9217893804.

The spelling of 21933610 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred ten".