23231222221 has 2 divisors, whose sum is σ = 23231222222. Its totient is φ = 23231222220.

The previous prime is 23231222123. The next prime is 23231222239. The reversal of 23231222221 is 12222213232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16593046596 + 6638175625 = 128814^2 + 81475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23231222221 is a prime.

It is a super-3 number, since 3×23231222221³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23231222192 and 23231222201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23231222251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11615611110 + 11615611111.

It is an arithmetic number, because the mean of its divisors is an integer number (11615611111).

Almost surely, 2^23231222221 is an apocalyptic number.

It is an amenable number.

23231222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23231222221 is an equidigital number, since it uses as much as digits as its factorization.

23231222221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

Adding to 23231222221 its reverse (12222213232), we get a palindrome (35453435453).

The spelling of 23231222221 in words is "twenty-three billion, two hundred thirty-one million, two hundred twenty-two thousand, two hundred twenty-one".