12933951221 has 2 divisors, whose sum is σ = 12933951222. Its totient is φ = 12933951220.

The previous prime is 12933951137. The next prime is 12933951229. The reversal of 12933951221 is 12215933921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12324108196 + 609843025 = 111014^2 + 24695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12933951221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12933951229) 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, 6466975610 + 6466975611.

It is an arithmetic number, because the mean of its divisors is an integer number (6466975611).

Almost surely, 2^12933951221 is an apocalyptic number.

It is an amenable number.

12933951221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12933951221 is an equidigital number, since it uses as much as digits as its factorization.

12933951221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The spelling of 12933951221 in words is "twelve billion, nine hundred thirty-three million, nine hundred fifty-one thousand, two hundred twenty-one".