21662396 has 12 divisors (see below), whose sum is σ = 43324848. Its totient is φ = 9283872.

The previous prime is 21662393. The next prime is 21662447. The reversal of 21662396 is 69326612.

21662396 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21662393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386801 + ... + 386856.

It is an arithmetic number, because the mean of its divisors is an integer number (3610404).

Almost surely, 2^21662396 is an apocalyptic number.

It is an amenable number.

21662396 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21662396 is a wasteful number, since it uses less digits than its factorization.

21662396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773668 (or 773666 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 21662396 is about 4654.2879154603. The cubic root of 21662396 is about 278.7632357125.

The spelling of 21662396 in words is "twenty-one million, six hundred sixty-two thousand, three hundred ninety-six".