21196880 has 20 divisors (see below), whose sum is σ = 49282932. Its totient is φ = 8478720.

The previous prime is 21196853. The next prime is 21196891. The reversal of 21196880 is 8869112.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 13601344 = 2756^2 + 3688^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21196880.

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, 132401 + ... + 132560.

Almost surely, 2^21196880 is an apocalyptic number.

21196880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21196880 is an abundant number, since it is smaller than the sum of its proper divisors (28086052).

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

21196880 is a wasteful number, since it uses less digits than its factorization.

21196880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264974 (or 264968 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 21196880 is about 4604.0069504726. The cubic root of 21196880 is about 276.7519228873.

The spelling of 21196880 in words is "twenty-one million, one hundred ninety-six thousand, eight hundred eighty".