21550992 has 40 divisors (see below), whose sum is σ = 55922016. Its totient is φ = 7151616.

The previous prime is 21550939. The next prime is 21551039. The reversal of 21550992 is 29905512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11463 + ... + 13209.

Almost surely, 2^21550992 is an apocalyptic number.

It is an amenable number.

21550992 is an abundant number, since it is smaller than the sum of its proper divisors (34371024).

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

21550992 is a wasteful number, since it uses less digits than its factorization.

21550992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015 (or 2009 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 21550992 is about 4642.3046000882. The cubic root of 21550992 is about 278.2845455341.

The spelling of 21550992 in words is "twenty-one million, five hundred fifty thousand, nine hundred ninety-two".