12213013261 has 2 divisors, whose sum is σ = 12213013262. Its totient is φ = 12213013260.

The previous prime is 12213013259. The next prime is 12213013273. The reversal of 12213013261 is 16231031221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11484337225 + 728676036 = 107165^2 + 26994^2 .

It is a cyclic number.

It is not a de Polignac number, because 12213013261 - 2¹ = 12213013259 is a prime.

Together with 12213013259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12213013291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106506630 + 6106506631.

It is an arithmetic number, because the mean of its divisors is an integer number (6106506631).

Almost surely, 2^12213013261 is an apocalyptic number.

It is an amenable number.

12213013261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12213013261 is an equidigital number, since it uses as much as digits as its factorization.

12213013261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 12213013261 its reverse (16231031221), we get a palindrome (28444044482).

The spelling of 12213013261 in words is "twelve billion, two hundred thirteen million, thirteen thousand, two hundred sixty-one".