21715426434 has 48 divisors (see below), whose sum is σ = 47134354176. Its totient is φ = 6630255840.

The previous prime is 21715426423. The next prime is 21715426441. The reversal of 21715426434 is 43462451712.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21715426392 and 21715426401.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1330447 + ... + 1346669.

It is an arithmetic number, because the mean of its divisors is an integer number (981965712).

Almost surely, 2^21715426434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21715426434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23567177088).

21715426434 is an abundant number, since it is smaller than the sum of its proper divisors (25418927742).

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

21715426434 is a wasteful number, since it uses less digits than its factorization.

21715426434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16503 (or 16372 counting only the distinct ones).

The product of its digits is 161280, while the sum is 39.

The spelling of 21715426434 in words is "twenty-one billion, seven hundred fifteen million, four hundred twenty-six thousand, four hundred thirty-four".