23213321221 has 2 divisors, whose sum is σ = 23213321222. Its totient is φ = 23213321220.

The previous prime is 23213321207. The next prime is 23213321267. The reversal of 23213321221 is 12212331232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20338752996 + 2874568225 = 142614^2 + 53615^2 .

It is a cyclic number.

It is not a de Polignac number, because 23213321221 - 2¹⁷ = 23213190149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23213321192 and 23213321201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23213324221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606660610 + 11606660611.

It is an arithmetic number, because the mean of its divisors is an integer number (11606660611).

Almost surely, 2^23213321221 is an apocalyptic number.

It is an amenable number.

23213321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213321221 is an equidigital number, since it uses as much as digits as its factorization.

23213321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

Adding to 23213321221 its reverse (12212331232), we get a palindrome (35425652453).

The spelling of 23213321221 in words is "twenty-three billion, two hundred thirteen million, three hundred twenty-one thousand, two hundred twenty-one".