23211213121 has 2 divisors, whose sum is σ = 23211213122. Its totient is φ = 23211213120.

The previous prime is 23211213119. The next prime is 23211213161. The reversal of 23211213121 is 12131211232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22277055025 + 934158096 = 149255^2 + 30564^2 .

It is a cyclic number.

It is not a de Polignac number, because 23211213121 - 2¹ = 23211213119 is a prime.

Together with 23211213119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23211213161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11605606560 + 11605606561.

It is an arithmetic number, because the mean of its divisors is an integer number (11605606561).

Almost surely, 2^23211213121 is an apocalyptic number.

It is an amenable number.

23211213121 is a deficient number, since it is larger than the sum of its proper divisors (1).

23211213121 is an equidigital number, since it uses as much as digits as its factorization.

23211213121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

Adding to 23211213121 its reverse (12131211232), we get a palindrome (35342424353).

The spelling of 23211213121 in words is "twenty-three billion, two hundred eleven million, two hundred thirteen thousand, one hundred twenty-one".