21634698 has 8 divisors (see below), whose sum is σ = 43269408. Its totient is φ = 7211564.

The previous prime is 21634663. The next prime is 21634699. The reversal of 21634698 is 89643612.

It is a sphenic number, since it is the product of 3 distinct primes.

21634698 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21634699) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1802886 + ... + 1802897.

It is an arithmetic number, because the mean of its divisors is an integer number (5408676).

Almost surely, 2^21634698 is an apocalyptic number.

21634698 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21634698 is a wasteful number, since it uses less digits than its factorization.

21634698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3605788.

The product of its digits is 62208, while the sum is 39.

The square root of 21634698 is about 4651.3114279738. The cubic root of 21634698 is about 278.6443741722.

The spelling of 21634698 in words is "twenty-one million, six hundred thirty-four thousand, six hundred ninety-eight".