21866163274 has 4 divisors (see below), whose sum is σ = 32799244914. Its totient is φ = 10933081636.

The previous prime is 21866163271. The next prime is 21866163329. The reversal of 21866163274 is 47236166812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21758315049 + 107848225 = 147507^2 + 10385^2 .

It is not an unprimeable number, because it can be changed into a prime (21866163271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5466540817 + ... + 5466540820.

Almost surely, 2^21866163274 is an apocalyptic number.

21866163274 is a deficient number, since it is larger than the sum of its proper divisors (10933081640).

21866163274 is a wasteful number, since it uses less digits than its factorization.

21866163274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10933081639.

The product of its digits is 580608, while the sum is 46.

The spelling of 21866163274 in words is "twenty-one billion, eight hundred sixty-six million, one hundred sixty-three thousand, two hundred seventy-four".