21233328125 has 14 divisors (see below), whose sum is σ = 26541339954. Its totient is φ = 16986650000.

The previous prime is 21233328113. The next prime is 21233328203. The reversal of 21233328125 is 52182333212.

It can be written as a sum of positive squares in 7 ways, for example, as 21016590841 + 216737284 = 144971^2 + 14722^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21233328125 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233328091 and 21233328100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 663842 + ... + 695091.

Almost surely, 2^21233328125 is an apocalyptic number.

21233328125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21233328125 is a deficient number, since it is larger than the sum of its proper divisors (5308011829).

21233328125 is an frugal number, since it uses more digits than its factorization.

21233328125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358963 (or 1358938 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The spelling of 21233328125 in words is "twenty-one billion, two hundred thirty-three million, three hundred twenty-eight thousand, one hundred twenty-five".