21194872 has 16 divisors (see below), whose sum is σ = 40665240. Its totient is φ = 10350816.

The previous prime is 21194863. The next prime is 21194879. The reversal of 21194872 is 27849112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21194879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30463 + ... + 31150.

Almost surely, 2^21194872 is an apocalyptic number.

It is an amenable number.

21194872 is a deficient number, since it is larger than the sum of its proper divisors (19470368).

21194872 is a wasteful number, since it uses less digits than its factorization.

21194872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61662 (or 61658 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 21194872 is about 4603.7888743947. The cubic root of 21194872 is about 276.7431836230.

The spelling of 21194872 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred seventy-two".