21144996 has 24 divisors (see below), whose sum is σ = 54820640. Its totient is φ = 7048296.

The previous prime is 21144989. The next prime is 21145001. The reversal of 21144996 is 69944112.

It is a happy number.

It is a super-2 number, since 2×21144996² = 894221711680032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21144996.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97786 + ... + 98001.

Almost surely, 2^21144996 is an apocalyptic number.

It is an amenable number.

21144996 is an abundant number, since it is smaller than the sum of its proper divisors (33675644).

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

21144996 is a wasteful number, since it uses less digits than its factorization.

21144996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195800 (or 195792 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21144996 is about 4598.3688412306. The cubic root of 21144996 is about 276.5259347809.

The spelling of 21144996 in words is "twenty-one million, one hundred forty-four thousand, nine hundred ninety-six".