126436121321599 has 4 divisors (see below), whose sum is σ = 126988244122360. Its totient is φ = 125883998520840.

The previous prime is 126436121321597. The next prime is 126436121321617. The reversal of 126436121321599 is 995123121634621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126436121321599 - 2¹ = 126436121321597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126436121321597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276061400037 + ... + 276061400494.

It is an arithmetic number, because the mean of its divisors is an integer number (31747061030590).

Almost surely, 2^{126436121321599} is an apocalyptic number.

126436121321599 is a deficient number, since it is larger than the sum of its proper divisors (552122800761).

126436121321599 is an equidigital number, since it uses as much as digits as its factorization.

126436121321599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552122800760.

The product of its digits is 4199040, while the sum is 55.

The spelling of 126436121321599 in words is "one hundred twenty-six trillion, four hundred thirty-six billion, one hundred twenty-one million, three hundred twenty-one thousand, five hundred ninety-nine".