12213331021 has 2 divisors, whose sum is σ = 12213331022. Its totient is φ = 12213331020.

The previous prime is 12213331007. The next prime is 12213331057. The reversal of 12213331021 is 12013331221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11510285796 + 703045225 = 107286^2 + 26515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12213331021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12213331021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12213331721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106665510 + 6106665511.

It is an arithmetic number, because the mean of its divisors is an integer number (6106665511).

Almost surely, 2^12213331021 is an apocalyptic number.

It is an amenable number.

12213331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12213331021 is an equidigital number, since it uses as much as digits as its factorization.

12213331021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12213331021 its reverse (12013331221), we get a palindrome (24226662242).

The spelling of 12213331021 in words is "twelve billion, two hundred thirteen million, three hundred thirty-one thousand, twenty-one".