126259455221 has 2 divisors, whose sum is σ = 126259455222. Its totient is φ = 126259455220.

The previous prime is 126259455103. The next prime is 126259455281. The reversal of 126259455221 is 122554952621.

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., 109094787025 + 17164668196 = 330295^2 + 131014^2 .

It is a cyclic number.

It is not a de Polignac number, because 126259455221 - 2¹⁸ = 126259193077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126259455281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63129727610 + 63129727611.

It is an arithmetic number, because the mean of its divisors is an integer number (63129727611).

Almost surely, 2^126259455221 is an apocalyptic number.

It is an amenable number.

126259455221 is a deficient number, since it is larger than the sum of its proper divisors (1).

126259455221 is an equidigital number, since it uses as much as digits as its factorization.

126259455221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 44.

The spelling of 126259455221 in words is "one hundred twenty-six billion, two hundred fifty-nine million, four hundred fifty-five thousand, two hundred twenty-one".