21636950 has 24 divisors (see below), whose sum is σ = 40367208. Its totient is φ = 8628480.

The previous prime is 21636949. The next prime is 21636961. The reversal of 21636950 is 5963612.

It is a happy number.

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, 31814 + ... + 32486.

It is an arithmetic number, because the mean of its divisors is an integer number (1681967).

Almost surely, 2^21636950 is an apocalyptic number.

21636950 is a deficient number, since it is larger than the sum of its proper divisors (18730258).

21636950 is a wasteful number, since it uses less digits than its factorization.

21636950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21636950 is about 4651.5535039382. The cubic root of 21636950 is about 278.6540420578.

The spelling of 21636950 in words is "twenty-one million, six hundred thirty-six thousand, nine hundred fifty".