21694698 has 24 divisors (see below), whose sum is σ = 47326500. Its totient is φ = 7182144.

The previous prime is 21694693. The next prime is 21694709. The reversal of 21694698 is 89649612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15657849 + 6036849 = 3957^2 + 2457^2 .

It is a super-2 number, since 2×21694698² = 941319842622408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21694693) 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 11 ways as a sum of consecutive naturals, for example, 1363 + ... + 6726.

Almost surely, 2^21694698 is an apocalyptic number.

21694698 is an abundant number, since it is smaller than the sum of its proper divisors (25631802).

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

21694698 is a wasteful number, since it uses less digits than its factorization.

21694698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8246 (or 8243 counting only the distinct ones).

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

The square root of 21694698 is about 4657.7567562079. The cubic root of 21694698 is about 278.9017266715.

The spelling of 21694698 in words is "twenty-one million, six hundred ninety-four thousand, six hundred ninety-eight".