21311696 has 20 divisors (see below), whose sum is σ = 47190432. Its totient is φ = 9133536.

The previous prime is 21311683. The next prime is 21311701. The reversal of 21311696 is 69611312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95030 + ... + 95253.

Almost surely, 2^21311696 is an apocalyptic number.

It is an amenable number.

21311696 is an abundant number, since it is smaller than the sum of its proper divisors (25878736).

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

21311696 is a wasteful number, since it uses less digits than its factorization.

21311696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190298 (or 190292 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 21311696 is about 4616.4592492515. The cubic root of 21311696 is about 277.2507124655.

The spelling of 21311696 in words is "twenty-one million, three hundred eleven thousand, six hundred ninety-six".