21325380128 has 48 divisors (see below), whose sum is σ = 46672448256. Its totient is φ = 9524977920.

The previous prime is 21325380071. The next prime is 21325380149. The reversal of 21325380128 is 82108352312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813926 + ... + 839717.

It is an arithmetic number, because the mean of its divisors is an integer number (972342672).

Almost surely, 2^21325380128 is an apocalyptic number.

It is an amenable number.

21325380128 is an abundant number, since it is smaller than the sum of its proper divisors (25347068128).

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

21325380128 is a wasteful number, since it uses less digits than its factorization.

21325380128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653697 (or 1653689 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21325380128 in words is "twenty-one billion, three hundred twenty-five million, three hundred eighty thousand, one hundred twenty-eight".