21864376 has 32 divisors (see below), whose sum is σ = 43023600. Its totient is φ = 10402560.

The previous prime is 21864361. The next prime is 21864377. The reversal of 21864376 is 67346812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21864377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16291 + ... + 17581.

Almost surely, 2^21864376 is an apocalyptic number.

It is an amenable number.

21864376 is a deficient number, since it is larger than the sum of its proper divisors (21159224).

21864376 is a wasteful number, since it uses less digits than its factorization.

21864376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1395 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 21864376 is about 4675.9358421604. The cubic root of 21864376 is about 279.6269521836.

The spelling of 21864376 in words is "twenty-one million, eight hundred sixty-four thousand, three hundred seventy-six".