21898452 has 12 divisors (see below), whose sum is σ = 51096416. Its totient is φ = 7299480.

The previous prime is 21898447. The next prime is 21898453. The reversal of 21898452 is 25489812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21898452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898453) 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, 912424 + ... + 912447.

Almost surely, 2^21898452 is an apocalyptic number.

It is an amenable number.

21898452 is an abundant number, since it is smaller than the sum of its proper divisors (29197964).

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

21898452 is a wasteful number, since it uses less digits than its factorization.

21898452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824878 (or 1824876 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 21898452 is about 4679.5781861189. The cubic root of 21898452 is about 279.7721445605.

The spelling of 21898452 in words is "twenty-one million, eight hundred ninety-eight thousand, four hundred fifty-two".