21923396 has 12 divisors (see below), whose sum is σ = 41853840. Its totient is φ = 9965160.

The previous prime is 21923389. The next prime is 21923399. The reversal of 21923396 is 69332912.

It is not an unprimeable number, because it can be changed into a prime (21923399) 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, 249086 + ... + 249173.

It is an arithmetic number, because the mean of its divisors is an integer number (3487820).

Almost surely, 2^21923396 is an apocalyptic number.

It is an amenable number.

21923396 is a deficient number, since it is larger than the sum of its proper divisors (19930444).

21923396 is a wasteful number, since it uses less digits than its factorization.

21923396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498274 (or 498272 counting only the distinct ones).

The product of its digits is 17496, while the sum is 35.

The square root of 21923396 is about 4682.2426250676. The cubic root of 21923396 is about 279.8783314927.

The spelling of 21923396 in words is "twenty-one million, nine hundred twenty-three thousand, three hundred ninety-six".