126044515021 has 2 divisors, whose sum is σ = 126044515022. Its totient is φ = 126044515020.

The previous prime is 126044515019. The next prime is 126044515031. The reversal of 126044515021 is 120515440621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104079792996 + 21964722025 = 322614^2 + 148205^2 .

It is a cyclic number.

It is not a de Polignac number, because 126044515021 - 2¹ = 126044515019 is a prime.

Together with 126044515019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126044515001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63022257510 + 63022257511.

It is an arithmetic number, because the mean of its divisors is an integer number (63022257511).

Almost surely, 2^126044515021 is an apocalyptic number.

It is an amenable number.

126044515021 is a deficient number, since it is larger than the sum of its proper divisors (1).

126044515021 is an equidigital number, since it uses as much as digits as its factorization.

126044515021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 126044515021 its reverse (120515440621), we get a palindrome (246559955642).

The spelling of 126044515021 in words is "one hundred twenty-six billion, forty-four million, five hundred fifteen thousand, twenty-one".