23212021331 has 2 divisors, whose sum is σ = 23212021332. Its totient is φ = 23212021330.

The previous prime is 23212021309. The next prime is 23212021387. The reversal of 23212021331 is 13312021232.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23212021331 is a prime.

It is a super-2 number, since 2×23212021331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23212021831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606010665 + 11606010666.

It is an arithmetic number, because the mean of its divisors is an integer number (11606010666).

Almost surely, 2^23212021331 is an apocalyptic number.

23212021331 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212021331 is an equidigital number, since it uses as much as digits as its factorization.

23212021331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23212021331 its reverse (13312021232), we get a palindrome (36524042563).

Subtracting from 23212021331 its reverse (13312021232), we obtain a palindrome (9900000099).

The spelling of 23212021331 in words is "twenty-three billion, two hundred twelve million, twenty-one thousand, three hundred thirty-one".