21898182 has 16 divisors (see below), whose sum is σ = 44865072. Its totient is φ = 7121280.

The previous prime is 21898181. The next prime is 21898187. The reversal of 21898182 is 28189812.

It is a self number, because there is not a number n which added to its sum of digits gives 21898182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44263 + ... + 44754.

It is an arithmetic number, because the mean of its divisors is an integer number (2804067).

Almost surely, 2^21898182 is an apocalyptic number.

21898182 is an abundant number, since it is smaller than the sum of its proper divisors (22966890).

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

21898182 is a wasteful number, since it uses less digits than its factorization.

21898182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89063.

The product of its digits is 18432, while the sum is 39.

The square root of 21898182 is about 4679.5493372760. The cubic root of 21898182 is about 279.7709947259.

The spelling of 21898182 in words is "twenty-one million, eight hundred ninety-eight thousand, one hundred eighty-two".