23320131221 has 2 divisors, whose sum is σ = 23320131222. Its totient is φ = 23320131220.

The previous prime is 23320131209. The next prime is 23320131301. The reversal of 23320131221 is 12213102332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23233380625 + 86750596 = 152425^2 + 9314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23320131221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23320131193 and 23320131202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23320134221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11660065610 + 11660065611.

It is an arithmetic number, because the mean of its divisors is an integer number (11660065611).

Almost surely, 2^23320131221 is an apocalyptic number.

It is an amenable number.

23320131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23320131221 is an equidigital number, since it uses as much as digits as its factorization.

23320131221 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 23320131221 its reverse (12213102332), we get a palindrome (35533233553).

The spelling of 23320131221 in words is "twenty-three billion, three hundred twenty million, one hundred thirty-one thousand, two hundred twenty-one".