21204950 has 96 divisors (see below), whose sum is σ = 47809440. Its totient is φ = 6912000.

The previous prime is 21204949. The next prime is 21205021. The reversal of 21204950 is 5940212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 209900 + ... + 210000.

It is an arithmetic number, because the mean of its divisors is an integer number (498015).

Almost surely, 2^21204950 is an apocalyptic number.

21204950 is an abundant number, since it is smaller than the sum of its proper divisors (26604490).

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

21204950 is a wasteful number, since it uses less digits than its factorization.

21204950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21204950 is about 4604.8832775652. The cubic root of 21204950 is about 276.7870397637.

The spelling of 21204950 in words is "twenty-one million, two hundred four thousand, nine hundred fifty".