21863192 has 48 divisors (see below), whose sum is σ = 45105840. Its totient is φ = 9929088.

The previous prime is 21863183. The next prime is 21863201. The reversal of 21863192 is 29136812.

It is an interprime number because it is at equal distance from previous prime (21863183) and next prime (21863201).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139178 + ... + 139334.

It is an arithmetic number, because the mean of its divisors is an integer number (939705).

Almost surely, 2^21863192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21863192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22552920).

21863192 is an abundant number, since it is smaller than the sum of its proper divisors (23242648).

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

21863192 is a wasteful number, since it uses less digits than its factorization.

21863192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 275 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 21863192 is about 4675.8092347742. The cubic root of 21863192 is about 279.6219046383.

The spelling of 21863192 in words is "twenty-one million, eight hundred sixty-three thousand, one hundred ninety-two".