21898232 has 16 divisors (see below), whose sum is σ = 41337000. Its totient is φ = 10875040.

The previous prime is 21898189. The next prime is 21898237. The reversal of 21898232 is 23289812.

It is a super-3 number, since 3×21898232³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21898192 and 21898201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7994 + ... + 10377.

Almost surely, 2^21898232 is an apocalyptic number.

It is an amenable number.

21898232 is a deficient number, since it is larger than the sum of its proper divisors (19438768).

21898232 is a wasteful number, since it uses less digits than its factorization.

21898232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18526 (or 18522 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21898232 is about 4679.5546796677. The cubic root of 21898232 is about 279.7712076590.

The spelling of 21898232 in words is "twenty-one million, eight hundred ninety-eight thousand, two hundred thirty-two".