21194856 has 48 divisors (see below), whose sum is σ = 57620160. Its totient is φ = 7038240.

The previous prime is 21194851. The next prime is 21194863. The reversal of 21194856 is 65849112.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21194856.

It is not an unprimeable number, because it can be changed into a prime (21194851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30691 + ... + 31373.

It is an arithmetic number, because the mean of its divisors is an integer number (1200420).

Almost surely, 2^21194856 is an apocalyptic number.

It is an amenable number.

21194856 is an abundant number, since it is smaller than the sum of its proper divisors (36425304).

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

21194856 is a wasteful number, since it uses less digits than its factorization.

21194856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126 (or 1119 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 21194856 is about 4603.7871366952. The cubic root of 21194856 is about 276.7431139852.

The spelling of 21194856 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred fifty-six".