21936996 has 18 divisors (see below), whose sum is σ = 55451942. Its totient is φ = 7312320.

The previous prime is 21936989. The next prime is 21937031. The reversal of 21936996 is 69963912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 34596 = 4680^2 + 186^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 304645 + ... + 304716.

Almost surely, 2^21936996 is an apocalyptic number.

It is an amenable number.

21936996 is an abundant number, since it is smaller than the sum of its proper divisors (33514946).

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

21936996 is a wasteful number, since it uses less digits than its factorization.

21936996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609371 (or 609366 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 21936996 is about 4683.6946954301. The cubic root of 21936996 is about 279.9361929436.

The spelling of 21936996 in words is "twenty-one million, nine hundred thirty-six thousand, nine hundred ninety-six".