21192885 has 48 divisors (see below), whose sum is σ = 44204160. Its totient is φ = 9175680.

The previous prime is 21192877. The next prime is 21192887. The reversal of 21192885 is 58829112.

It is not a de Polignac number, because 21192885 - 2³ = 21192877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21192887) 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 47 ways as a sum of consecutive naturals, for example, 4215 + ... + 7755.

It is an arithmetic number, because the mean of its divisors is an integer number (920920).

Almost surely, 2^21192885 is an apocalyptic number.

It is an amenable number.

21192885 is an abundant number, since it is smaller than the sum of its proper divisors (23011275).

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

21192885 is a wasteful number, since it uses less digits than its factorization.

21192885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578 (or 3575 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 21192885 is about 4603.5730688238. The cubic root of 21192885 is about 276.7345352120.

It can be divided in two parts, 211 and 92885, that added together give a triangular number (93096 = T₄₃₁).

The spelling of 21192885 in words is "twenty-one million, one hundred ninety-two thousand, eight hundred eighty-five".