21233325331 has 2 divisors, whose sum is σ = 21233325332. Its totient is φ = 21233325330.

The previous prime is 21233325319. The next prime is 21233325359. The reversal of 21233325331 is 13352333212.

It is an a-pointer prime, because the next prime (21233325359) can be obtained adding 21233325331 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21233325331 - 2¹⁹ = 21232801043 is a prime.

It is a super-2 number, since 2×21233325331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21233325331.

It is not a weakly prime, because it can be changed into another prime (21233325371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616662665 + 10616662666.

It is an arithmetic number, because the mean of its divisors is an integer number (10616662666).

Almost surely, 2^21233325331 is an apocalyptic number.

21233325331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233325331 is an equidigital number, since it uses as much as digits as its factorization.

21233325331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 28.

Adding to 21233325331 its reverse (13352333212), we get a palindrome (34585658543).

The spelling of 21233325331 in words is "twenty-one billion, two hundred thirty-three million, three hundred twenty-five thousand, three hundred thirty-one".