21052796128 has 96 divisors (see below), whose sum is σ = 51490059264. Its totient is φ = 8250619392.

The previous prime is 21052796117. The next prime is 21052796143. The reversal of 21052796128 is 82169725012.

It is a congruent number.

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, 277801 + ... + 345367.

It is an arithmetic number, because the mean of its divisors is an integer number (536354784).

Almost surely, 2^21052796128 is an apocalyptic number.

21052796128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21052796128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25745029632).

21052796128 is an abundant number, since it is smaller than the sum of its proper divisors (30437263136).

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

21052796128 is a wasteful number, since it uses less digits than its factorization.

21052796128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67704 (or 67696 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 21052796128 in words is "twenty-one billion, fifty-two million, seven hundred ninety-six thousand, one hundred twenty-eight".