126221279 has 2 divisors, whose sum is σ = 126221280. Its totient is φ = 126221278.

The previous prime is 126221257. The next prime is 126221281. The reversal of 126221279 is 972122621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126221279 - 2¹² = 126217183 is a prime.

It is a super-2 number, since 2×126221279² = 31863622544791682, which contains 22 as substring.

Together with 126221281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126221219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63110639 + 63110640.

It is an arithmetic number, because the mean of its divisors is an integer number (63110640).

Almost surely, 2^126221279 is an apocalyptic number.

126221279 is a deficient number, since it is larger than the sum of its proper divisors (1).

126221279 is an equidigital number, since it uses as much as digits as its factorization.

126221279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 126221279 is about 11234.8243867005. The cubic root of 126221279 is about 501.6230974083.

The spelling of 126221279 in words is "one hundred twenty-six million, two hundred twenty-one thousand, two hundred seventy-nine".