21155696 has 20 divisors (see below), whose sum is σ = 41074752. Its totient is φ = 10555776.

The previous prime is 21155681. The next prime is 21155723. The reversal of 21155696 is 69655112.

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, 8801 + ... + 10943.

Almost surely, 2^21155696 is an apocalyptic number.

It is an amenable number.

21155696 is a deficient number, since it is larger than the sum of its proper divisors (19919056).

21155696 is a wasteful number, since it uses less digits than its factorization.

21155696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 2762 counting only the distinct ones).

The product of its digits is 16200, while the sum is 35.

The square root of 21155696 is about 4599.5321501214. The cubic root of 21155696 is about 276.5725703782.

The spelling of 21155696 in words is "twenty-one million, one hundred fifty-five thousand, six hundred ninety-six".