21325353233 has 12 divisors (see below), whose sum is σ = 22315507620. Its totient is φ = 20377437696.

The previous prime is 21325353229. The next prime is 21325353239. The reversal of 21325353233 is 33235352312.

It can be written as a sum of positive squares in 2 ways, for example, as 11310747904 + 10014605329 = 106352^2 + 100073^2 .

It is not a de Polignac number, because 21325353233 - 2² = 21325353229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21325353233.

It is not an unprimeable number, because it can be changed into a prime (21325353239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 513785 + ... + 553737.

It is an arithmetic number, because the mean of its divisors is an integer number (1859625635).

Almost surely, 2^21325353233 is an apocalyptic number.

21325353233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21325353233 is a deficient number, since it is larger than the sum of its proper divisors (990154387).

21325353233 is a wasteful number, since it uses less digits than its factorization.

21325353233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41008 (or 40985 counting only the distinct ones).

The product of its digits is 48600, while the sum is 32.

The spelling of 21325353233 in words is "twenty-one billion, three hundred twenty-five million, three hundred fifty-three thousand, two hundred thirty-three".