212323121321 has 2 divisors, whose sum is σ = 212323121322. Its totient is φ = 212323121320.

The previous prime is 212323121249. The next prime is 212323121363. The reversal of 212323121321 is 123121323212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139174509721 + 73148611600 = 373061^2 + 270460^2 .

It is a cyclic number.

It is not a de Polignac number, because 212323121321 - 2¹⁰ = 212323120297 is a prime.

It is a super-2 number, since 2×212323121321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212323123321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106161560660 + 106161560661.

It is an arithmetic number, because the mean of its divisors is an integer number (106161560661).

Almost surely, 2^212323121321 is an apocalyptic number.

It is an amenable number.

212323121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

212323121321 is an equidigital number, since it uses as much as digits as its factorization.

212323121321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 212323121321 its reverse (123121323212), we get a palindrome (335444444533).

The spelling of 212323121321 in words is "two hundred twelve billion, three hundred twenty-three million, one hundred twenty-one thousand, three hundred twenty-one".