21550996 has 6 divisors (see below), whose sum is σ = 37714250. Its totient is φ = 10775496.

The previous prime is 21550939. The next prime is 21551039. The reversal of 21550996 is 69905512.

It can be written as a sum of positive squares in only one way, i.e., 14976900 + 6574096 = 3870^2 + 2564^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2693871 + ... + 2693878.

Almost surely, 2^21550996 is an apocalyptic number.

It is an amenable number.

21550996 is a deficient number, since it is larger than the sum of its proper divisors (16163254).

21550996 is a wasteful number, since it uses less digits than its factorization.

21550996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387753 (or 5387751 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 21550996 is about 4642.3050309087. The cubic root of 21550996 is about 278.2845627513.

The spelling of 21550996 in words is "twenty-one million, five hundred fifty thousand, nine hundred ninety-six".