12420690251 has 2 divisors, whose sum is σ = 12420690252. Its totient is φ = 12420690250.

The previous prime is 12420690239. The next prime is 12420690259. The reversal of 12420690251 is 15209602421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12420690251 - 2⁶ = 12420690187 is a prime.

It is a super-2 number, since 2×12420690251² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12420690259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210345125 + 6210345126.

It is an arithmetic number, because the mean of its divisors is an integer number (6210345126).

Almost surely, 2^12420690251 is an apocalyptic number.

12420690251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420690251 is an equidigital number, since it uses as much as digits as its factorization.

12420690251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 12420690251 in words is "twelve billion, four hundred twenty million, six hundred ninety thousand, two hundred fifty-one".