21386950 has 36 divisors (see below), whose sum is σ = 43092108. Its totient is φ = 7893600.

The previous prime is 21386947. The next prime is 21386971. The reversal of 21386950 is 5968312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7185 + ... + 9715.

It is an arithmetic number, because the mean of its divisors is an integer number (1197003).

Almost surely, 2^21386950 is an apocalyptic number.

21386950 is an abundant number, since it is smaller than the sum of its proper divisors (21705158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21386950 is a wasteful number, since it uses less digits than its factorization.

21386950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569 (or 2551 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21386950 is about 4624.6026856369. The cubic root of 21386950 is about 277.5766636115.

The spelling of 21386950 in words is "twenty-one million, three hundred eighty-six thousand, nine hundred fifty".