21715426432 has 96 divisors (see below), whose sum is σ = 52060009500. Its totient is φ = 8985618432.

The previous prime is 21715426423. The next prime is 21715426441. The reversal of 21715426432 is 23462451712.

It is an interprime number because it is at equal distance from previous prime (21715426423) and next prime (21715426441).

It can be written as a sum of positive squares in 2 ways, for example, as 21707896896 + 7529536 = 147336^2 + 2744^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21715426391 and 21715426400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122194 + ... + 241582.

Almost surely, 2^21715426432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21715426432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26030004750).

21715426432 is an abundant number, since it is smaller than the sum of its proper divisors (30344583068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21715426432 is a wasteful number, since it uses less digits than its factorization.

21715426432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119446 (or 119427 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The spelling of 21715426432 in words is "twenty-one billion, seven hundred fifteen million, four hundred twenty-six thousand, four hundred thirty-two".