21975063 has 16 divisors (see below), whose sum is σ = 32996352. Its totient is φ = 12888000.

The previous prime is 21975061. The next prime is 21975073. The reversal of 21975063 is 36057912.

It is not a de Polignac number, because 21975063 - 2¹ = 21975061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21975061) 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, 9718 + ... + 11763.

It is an arithmetic number, because the mean of its divisors is an integer number (2062272).

Almost surely, 2^21975063 is an apocalyptic number.

21975063 is a deficient number, since it is larger than the sum of its proper divisors (11021289).

21975063 is a wasteful number, since it uses less digits than its factorization.

21975063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21526.

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

The square root of 21975063 is about 4687.7567129705. The cubic root of 21975063 is about 280.0980226529.

It can be divided in two parts, 2197 and 5063, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 21975063 in words is "twenty-one million, nine hundred seventy-five thousand, sixty-three".