21863052 has 18 divisors (see below), whose sum is σ = 55265028. Its totient is φ = 7287672.

The previous prime is 21863047. The next prime is 21863057. The reversal of 21863052 is 25036812.

21863052 is a `hidden beast` number, since 21 + 8 + 630 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21863047) and next prime (21863057).

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (21863057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 303618 + ... + 303689.

Almost surely, 2^21863052 is an apocalyptic number.

It is an amenable number.

21863052 is an abundant number, since it is smaller than the sum of its proper divisors (33401976).

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

21863052 is a wasteful number, since it uses less digits than its factorization.

21863052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607317 (or 607312 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21863052 is about 4675.7942640796. The cubic root of 21863052 is about 279.6213077881.

Adding to 21863052 its reverse (25036812), we get a palindrome (46899864).

The spelling of 21863052 in words is "twenty-one million, eight hundred sixty-three thousand, fifty-two".