12420690221 has 2 divisors, whose sum is σ = 12420690222. Its totient is φ = 12420690220.

The previous prime is 12420690197. The next prime is 12420690239. The reversal of 12420690221 is 12209602421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10203222121 + 2217468100 = 101011^2 + 47090^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420690221 - 2⁶ = 12420690157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12420690251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210345110 + 6210345111.

It is an arithmetic number, because the mean of its divisors is an integer number (6210345111).

Almost surely, 2^12420690221 is an apocalyptic number.

It is an amenable number.

12420690221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420690221 is an equidigital number, since it uses as much as digits as its factorization.

12420690221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 12420690221 in words is "twelve billion, four hundred twenty million, six hundred ninety thousand, two hundred twenty-one".