21970563 has 8 divisors (see below), whose sum is σ = 30085968. Its totient is φ = 14251104.

The previous prime is 21970513. The next prime is 21970577. The reversal of 21970563 is 36507912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21970563 - 2⁶ = 21970499 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21970513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98856 + ... + 99077.

It is an arithmetic number, because the mean of its divisors is an integer number (3760746).

Almost surely, 2^21970563 is an apocalyptic number.

21970563 is a deficient number, since it is larger than the sum of its proper divisors (8115405).

21970563 is a wasteful number, since it uses less digits than its factorization.

21970563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197973.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21970563 is about 4687.2767146820. The cubic root of 21970563 is about 280.0789020836.

The spelling of 21970563 in words is "twenty-one million, nine hundred seventy thousand, five hundred sixty-three".