21352863 has 16 divisors (see below), whose sum is σ = 32613120. Its totient is φ = 12173376.

The previous prime is 21352861. The next prime is 21352883. The reversal of 21352863 is 36825312.

It is not a de Polignac number, because 21352863 - 2¹ = 21352861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21352863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11056 + ... + 12842.

It is an arithmetic number, because the mean of its divisors is an integer number (2038320).

Almost surely, 2^21352863 is an apocalyptic number.

21352863 is a deficient number, since it is larger than the sum of its proper divisors (11260257).

21352863 is a wasteful number, since it uses less digits than its factorization.

21352863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366.

The product of its digits is 8640, while the sum is 30.

The square root of 21352863 is about 4620.9158183200. The cubic root of 21352863 is about 277.4291158939.

The spelling of 21352863 in words is "twenty-one million, three hundred fifty-two thousand, eight hundred sixty-three".