21275950 has 12 divisors (see below), whose sum is σ = 39573360. Its totient is φ = 8510360.

The previous prime is 21275941. The next prime is 21275981. The reversal of 21275950 is 5957212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212710 + ... + 212809.

It is an arithmetic number, because the mean of its divisors is an integer number (3297780).

Almost surely, 2^21275950 is an apocalyptic number.

21275950 is a deficient number, since it is larger than the sum of its proper divisors (18297410).

21275950 is a wasteful number, since it uses less digits than its factorization.

21275950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425531 (or 425526 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 21275950 is about 4612.5860425579. The cubic root of 21275950 is about 277.0956153123.

The spelling of 21275950 in words is "twenty-one million, two hundred seventy-five thousand, nine hundred fifty".