21157468 has 12 divisors (see below), whose sum is σ = 37292920. Its totient is φ = 10502352.

The previous prime is 21157463. The next prime is 21157483. The reversal of 21157468 is 86475112.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21157463) 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, 18471 + ... + 19582.

Almost surely, 2^21157468 is an apocalyptic number.

It is an amenable number.

21157468 is a deficient number, since it is larger than the sum of its proper divisors (16135452).

21157468 is a wasteful number, since it uses less digits than its factorization.

21157468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38196 (or 38194 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 21157468 is about 4599.7247743751. The cubic root of 21157468 is about 276.5802920640.

The spelling of 21157468 in words is "twenty-one million, one hundred fifty-seven thousand, four hundred sixty-eight".