21634382 has 64 divisors (see below), whose sum is σ = 42854400. Its totient is φ = 8114400.

The previous prime is 21634337. The next prime is 21634399. The reversal of 21634382 is 28343612.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (6912) is a multiple of the sum of its prime divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354632 + ... + 354692.

It is an arithmetic number, because the mean of its divisors is an integer number (669600).

Almost surely, 2^21634382 is an apocalyptic number.

21634382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21634382 is a deficient number, since it is larger than the sum of its proper divisors (21220018).

21634382 is a wasteful number, since it uses less digits than its factorization.

21634382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 128 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21634382 is about 4651.2774589353. The cubic root of 21634382 is about 278.6430175235.

Adding to 21634382 its reverse (28343612), we get a palindrome (49977994).

The spelling of 21634382 in words is "twenty-one million, six hundred thirty-four thousand, three hundred eighty-two".