21674481947 has 16 divisors (see below), whose sum is σ = 22513075200. Its totient is φ = 20844858720.

The previous prime is 21674481929. The next prime is 21674481953. The reversal of 21674481947 is 74918447612.

It is a cyclic number.

It is not a de Polignac number, because 21674481947 - 2²⁰ = 21673433371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21674481967) 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, 7687304 + ... + 7690122.

It is an arithmetic number, because the mean of its divisors is an integer number (1407067200).

Almost surely, 2^21674481947 is an apocalyptic number.

21674481947 is a deficient number, since it is larger than the sum of its proper divisors (838593253).

21674481947 is a wasteful number, since it uses less digits than its factorization.

21674481947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its digits is 2709504, while the sum is 53.

The spelling of 21674481947 in words is "twenty-one billion, six hundred seventy-four million, four hundred eighty-one thousand, nine hundred forty-seven".