21634794 has 24 divisors (see below), whose sum is σ = 47218080. Its totient is φ = 7158888.

The previous prime is 21634741. The next prime is 21634799. The reversal of 21634794 is 49743612.

It is a super-2 number, since 2×21634794² = 936128622844872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21634799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1822 + ... + 6825.

It is an arithmetic number, because the mean of its divisors is an integer number (1967420).

Almost surely, 2^21634794 is an apocalyptic number.

21634794 is an abundant number, since it is smaller than the sum of its proper divisors (25583286).

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

21634794 is a wasteful number, since it uses less digits than its factorization.

21634794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8794 (or 8791 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21634794 is about 4651.3217476326. The cubic root of 21634794 is about 278.6447863160.

The spelling of 21634794 in words is "twenty-one million, six hundred thirty-four thousand, seven hundred ninety-four".