21180963 has 16 divisors (see below), whose sum is σ = 30067200. Its totient is φ = 13216896.

The previous prime is 21180949. The next prime is 21181001. The reversal of 21180963 is 36908112.

It is not a de Polignac number, because 21180963 - 2⁴ = 21180947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21180963.

It is not an unprimeable number, because it can be changed into a prime (21180923) 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, 9106 + ... + 11192.

It is an arithmetic number, because the mean of its divisors is an integer number (1879200).

Almost surely, 2^21180963 is an apocalyptic number.

21180963 is a deficient number, since it is larger than the sum of its proper divisors (8886237).

21180963 is a wasteful number, since it uses less digits than its factorization.

21180963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21180963 is about 4602.2780228926. The cubic root of 21180963 is about 276.6826333909.

The spelling of 21180963 in words is "twenty-one million, one hundred eighty thousand, nine hundred sixty-three".