21868152 has 16 divisors (see below), whose sum is σ = 54670440. Its totient is φ = 7289376.

The previous prime is 21868141. The next prime is 21868169. The reversal of 21868152 is 25186812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455563 + ... + 455610.

Almost surely, 2^21868152 is an apocalyptic number.

It is an amenable number.

21868152 is an abundant number, since it is smaller than the sum of its proper divisors (32802288).

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

21868152 is a wasteful number, since it uses less digits than its factorization.

21868152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911182 (or 911178 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 21868152 is about 4676.3395941698. The cubic root of 21868152 is about 279.6430485435.

The spelling of 21868152 in words is "twenty-one million, eight hundred sixty-eight thousand, one hundred fifty-two".