21839741952 has 176 divisors, whose sum is σ = 68327222400. Its totient is φ = 6071058432.

The previous prime is 21839741927. The next prime is 21839741993. The reversal of 21839741952 is 25914793812.

It is a junction number, because it is equal to n+sod(n) for n = 21839741895 and 21839741904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781924 + ... + 809372.

Almost surely, 2^21839741952 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 21839741952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34163611200).

21839741952 is an abundant number, since it is smaller than the sum of its proper divisors (46487480448).

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

21839741952 is a wasteful number, since it uses less digits than its factorization.

21839741952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27516 (or 27498 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The spelling of 21839741952 in words is "twenty-one billion, eight hundred thirty-nine million, seven hundred forty-one thousand, nine hundred fifty-two".