21696894 has 24 divisors (see below), whose sum is σ = 47115432. Its totient is φ = 7216080.

The previous prime is 21696877. The next prime is 21696923. The reversal of 21696894 is 49869612.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 9064 + ... + 11204.

It is an arithmetic number, because the mean of its divisors is an integer number (1963143).

Almost surely, 2^21696894 is an apocalyptic number.

21696894 is an abundant number, since it is smaller than the sum of its proper divisors (25418538).

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

21696894 is a wasteful number, since it uses less digits than its factorization.

21696894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712 (or 2709 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 21696894 is about 4657.9924860395. The cubic root of 21696894 is about 278.9111367668.

The spelling of 21696894 in words is "twenty-one million, six hundred ninety-six thousand, eight hundred ninety-four".