21180696 has 16 divisors (see below), whose sum is σ = 52951800. Its totient is φ = 7060224.

The previous prime is 21180683. The next prime is 21180697. The reversal of 21180696 is 69608112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21180697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441241 + ... + 441288.

Almost surely, 2^21180696 is an apocalyptic number.

It is an amenable number.

21180696 is an abundant number, since it is smaller than the sum of its proper divisors (31771104).

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

21180696 is a wasteful number, since it uses less digits than its factorization.

21180696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882538 (or 882534 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 21180696 is about 4602.2490154271. The cubic root of 21180696 is about 276.6814707970.

The spelling of 21180696 in words is "twenty-one million, one hundred eighty thousand, six hundred ninety-six".