21634760 has 32 divisors (see below), whose sum is σ = 55632960. Its totient is φ = 7417536.

The previous prime is 21634741. The next prime is 21634799. The reversal of 21634760 is 6743612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38354 + ... + 38913.

It is an arithmetic number, because the mean of its divisors is an integer number (1738530).

Almost surely, 2^21634760 is an apocalyptic number.

21634760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21634760 is an abundant number, since it is smaller than the sum of its proper divisors (33998200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21634760 is a wasteful number, since it uses less digits than its factorization.

21634760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77285 (or 77281 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 21634760 is about 4651.3180927561. The cubic root of 21634760 is about 278.6446403485.

The spelling of 21634760 in words is "twenty-one million, six hundred thirty-four thousand, seven hundred sixty".