123213321212021 has 2 divisors, whose sum is σ = 123213321212022. Its totient is φ = 123213321212020.

The previous prime is 123213321211997. The next prime is 123213321212071. The reversal of 123213321212021 is 120212123312321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75436346868100 + 47776974343921 = 8685410^2 + 6912089^2 .

It is a cyclic number.

It is not a de Polignac number, because 123213321212021 - 2¹⁴ = 123213321195637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123213321212071) 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, 61606660606010 + 61606660606011.

It is an arithmetic number, because the mean of its divisors is an integer number (61606660606011).

Almost surely, 2^{123213321212021} is an apocalyptic number.

It is an amenable number.

123213321212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123213321212021 is an equidigital number, since it uses as much as digits as its factorization.

123213321212021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 123213321212021 its reverse (120212123312321), we get a palindrome (243425444524342).

The spelling of 123213321212021 in words is "one hundred twenty-three trillion, two hundred thirteen billion, three hundred twenty-one million, two hundred twelve thousand, twenty-one".