21258950 has 24 divisors (see below), whose sum is σ = 39764568. Its totient is φ = 8455680.

The previous prime is 21258917. The next prime is 21258973. The reversal of 21258950 is 5985212.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8549 + ... + 10751.

It is an arithmetic number, because the mean of its divisors is an integer number (1656857).

Almost surely, 2^21258950 is an apocalyptic number.

21258950 is a deficient number, since it is larger than the sum of its proper divisors (18505618).

21258950 is a wasteful number, since it uses less digits than its factorization.

21258950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408 (or 2403 counting only the distinct ones).

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

The square root of 21258950 is about 4610.7428902510. The cubic root of 21258950 is about 277.0217936082.

The spelling of 21258950 in words is "twenty-one million, two hundred fifty-eight thousand, nine hundred fifty".