21696468 has 12 divisors (see below), whose sum is σ = 50625120. Its totient is φ = 7232152.

The previous prime is 21696457. The next prime is 21696487. The reversal of 21696468 is 86469612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 904008 + ... + 904031.

It is an arithmetic number, because the mean of its divisors is an integer number (4218760).

Almost surely, 2^21696468 is an apocalyptic number.

It is an amenable number.

21696468 is an abundant number, since it is smaller than the sum of its proper divisors (28928652).

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

21696468 is a wasteful number, since it uses less digits than its factorization.

21696468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808046 (or 1808044 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 21696468 is about 4657.9467579611. The cubic root of 21696468 is about 278.9093113608.

The spelling of 21696468 in words is "twenty-one million, six hundred ninety-six thousand, four hundred sixty-eight".