21496868 has 6 divisors (see below), whose sum is σ = 37619526. Its totient is φ = 10748432.

The previous prime is 21496841. The next prime is 21496877. The reversal of 21496868 is 86869412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12687844 + 8809024 = 3562^2 + 2968^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2687105 + ... + 2687112.

It is an arithmetic number, because the mean of its divisors is an integer number (6269921).

Almost surely, 2^21496868 is an apocalyptic number.

It is an amenable number.

21496868 is a deficient number, since it is larger than the sum of its proper divisors (16122658).

21496868 is a wasteful number, since it uses less digits than its factorization.

21496868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374221 (or 5374219 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 21496868 is about 4636.4715032015. The cubic root of 21496868 is about 278.0513853567.

The spelling of 21496868 in words is "twenty-one million, four hundred ninety-six thousand, eight hundred sixty-eight".