21992696 has 64 divisors (see below), whose sum is σ = 48612960. Its totient is φ = 9216000.

The previous prime is 21992693. The next prime is 21992723. The reversal of 21992696 is 69629912.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21992693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91136 + ... + 91376.

Almost surely, 2^21992696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21992696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24306480).

21992696 is an abundant number, since it is smaller than the sum of its proper divisors (26620264).

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

21992696 is a wasteful number, since it uses less digits than its factorization.

21992696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 332 counting only the distinct ones).

The product of its digits is 104976, while the sum is 44.

The square root of 21992696 is about 4689.6370861720. The cubic root of 21992696 is about 280.1729203980.

It can be divided in two parts, 219926 and 96, that added together give a palindrome (220022).

The spelling of 21992696 in words is "twenty-one million, nine hundred ninety-two thousand, six hundred ninety-six".