21928594752 has 140 divisors (see below), whose sum is σ = 65066766996. Its totient is φ = 7302389760.

The previous prime is 21928594711. The next prime is 21928594819. The reversal of 21928594752 is 25749582912.

21928594752 is a `hidden beast` number, since 2 + 1 + 92 + 85 + 9 + 475 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7677965376 + 14250629376 = 87624^2 + 119376^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9646288 + ... + 9648560.

Almost surely, 2^21928594752 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 21928594752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32533383498).

21928594752 is an abundant number, since it is smaller than the sum of its proper divisors (43138172244).

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

21928594752 is a wasteful number, since it uses less digits than its factorization.

21928594752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4158 (or 4139 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 21928594752 in words is "twenty-one billion, nine hundred twenty-eight million, five hundred ninety-four thousand, seven hundred fifty-two".