21715426433 has 4 divisors (see below), whose sum is σ = 21861167700. Its totient is φ = 21569685168.

The previous prime is 21715426423. The next prime is 21715426441. The reversal of 21715426433 is 33462451712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6936890944 + 14778535489 = 83288^2 + 121567^2 .

It is a cyclic number.

It is not a de Polignac number, because 21715426433 - 2²⁰ = 21714377857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21715426423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72870410 + ... + 72870707.

It is an arithmetic number, because the mean of its divisors is an integer number (5465291925).

Almost surely, 2^21715426433 is an apocalyptic number.

It is an amenable number.

21715426433 is a deficient number, since it is larger than the sum of its proper divisors (145741267).

21715426433 is a wasteful number, since it uses less digits than its factorization.

21715426433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145741266.

The product of its digits is 120960, while the sum is 38.

The spelling of 21715426433 in words is "twenty-one billion, seven hundred fifteen million, four hundred twenty-six thousand, four hundred thirty-three".