126532735721 has 24 divisors (see below), whose sum is σ = 150591409920. Its totient is φ = 105979491072.

The previous prime is 126532735669. The next prime is 126532735729. The reversal of 126532735721 is 127537235621.

It is not a de Polignac number, because 126532735721 - 2⁶ = 126532735657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126532735729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206996 + ... + 543978.

It is an arithmetic number, because the mean of its divisors is an integer number (6274642080).

Almost surely, 2^126532735721 is an apocalyptic number.

It is an amenable number.

126532735721 is a deficient number, since it is larger than the sum of its proper divisors (24058674199).

126532735721 is an equidigital number, since it uses as much as digits as its factorization.

126532735721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337173 (or 337166 counting only the distinct ones).

The product of its digits is 529200, while the sum is 44.

The spelling of 126532735721 in words is "one hundred twenty-six billion, five hundred thirty-two million, seven hundred thirty-five thousand, seven hundred twenty-one".