21739040576 has 56 divisors (see below), whose sum is σ = 47112692160. Its totient is φ = 9870336000.

The previous prime is 21739040573. The next prime is 21739040579. The reversal of 21739040576 is 67504093712.

It is an interprime number because it is at equal distance from previous prime (21739040573) and next prime (21739040579).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21739040573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630176 + ... + 663776.

Almost surely, 2^21739040576 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 21739040576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23556346080).

21739040576 is an abundant number, since it is smaller than the sum of its proper divisors (25373651584).

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

21739040576 is a wasteful number, since it uses less digits than its factorization.

21739040576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34543 (or 34533 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 21739040576 in words is "twenty-one billion, seven hundred thirty-nine million, forty thousand, five hundred seventy-six".