21796988 has 6 divisors (see below), whose sum is σ = 38144736. Its totient is φ = 10898492.

The previous prime is 21796981. The next prime is 21797003. The reversal of 21796988 is 88969712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2724620 + ... + 2724627.

It is an arithmetic number, because the mean of its divisors is an integer number (6357456).

Almost surely, 2^21796988 is an apocalyptic number.

It is an amenable number.

21796988 is a deficient number, since it is larger than the sum of its proper divisors (16347748).

21796988 is a wasteful number, since it uses less digits than its factorization.

21796988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5449251 (or 5449249 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 21796988 is about 4668.7244510680. The cubic root of 21796988 is about 279.3393779518.

The spelling of 21796988 in words is "twenty-one million, seven hundred ninety-six thousand, nine hundred eighty-eight".