12209870021 has 2 divisors, whose sum is σ = 12209870022. Its totient is φ = 12209870020.

The previous prime is 12209870009. The next prime is 12209870027. The reversal of 12209870021 is 12007890221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11529390625 + 680479396 = 107375^2 + 26086^2 .

It is a cyclic number.

It is not a de Polignac number, because 12209870021 - 2⁶ = 12209869957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12209870021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12209870027) 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, 6104935010 + 6104935011.

It is an arithmetic number, because the mean of its divisors is an integer number (6104935011).

Almost surely, 2^12209870021 is an apocalyptic number.

It is an amenable number.

12209870021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12209870021 is an equidigital number, since it uses as much as digits as its factorization.

12209870021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 12209870021 in words is "twelve billion, two hundred nine million, eight hundred seventy thousand, twenty-one".