21838364 has 12 divisors (see below), whose sum is σ = 38277288. Its totient is φ = 10902000.

The previous prime is 21838361. The next prime is 21838373. The reversal of 21838364 is 46383812.

It is a happy number.

It is a hoax number, since the sum of its digits (35) 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 (21838361) 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, 1187 + ... + 6714.

It is an arithmetic number, because the mean of its divisors is an integer number (3189774).

Almost surely, 2^21838364 is an apocalyptic number.

It is an amenable number.

21838364 is a deficient number, since it is larger than the sum of its proper divisors (16438924).

21838364 is a wasteful number, since it uses less digits than its factorization.

21838364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8596 (or 8594 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 21838364 is about 4673.1535390997. The cubic root of 21838364 is about 279.5160176560.

The spelling of 21838364 in words is "twenty-one million, eight hundred thirty-eight thousand, three hundred sixty-four".