126217744121 has 6 divisors (see below), whose sum is σ = 146824722810. Its totient is φ = 108186637776.

The previous prime is 126217744117. The next prime is 126217744127. The reversal of 126217744121 is 121447712621.

It can be written as a sum of positive squares in only one way, i.e., 110332922896 + 15884821225 = 332164^2 + 126035^2 .

It is not a de Polignac number, because 126217744121 - 2² = 126217744117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126217744127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1287936116 + ... + 1287936213.

It is an arithmetic number, because the mean of its divisors is an integer number (24470787135).

Almost surely, 2^126217744121 is an apocalyptic number.

It is an amenable number.

126217744121 is a deficient number, since it is larger than the sum of its proper divisors (20606978689).

126217744121 is an equidigital number, since it uses as much as digits as its factorization.

126217744121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575872343 (or 2575872336 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The spelling of 126217744121 in words is "one hundred twenty-six billion, two hundred seventeen million, seven hundred forty-four thousand, one hundred twenty-one".