126615340321 has 4 divisors (see below), whose sum is σ = 126630708912. Its totient is φ = 126599971732.

The previous prime is 126615340309. The next prime is 126615340361. The reversal of 126615340321 is 123043516621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126615340321 - 2¹⁷ = 126615209249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126615340361) 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, 7671931 + ... + 7688416.

It is an arithmetic number, because the mean of its divisors is an integer number (31657677228).

Almost surely, 2^126615340321 is an apocalyptic number.

It is an amenable number.

126615340321 is a deficient number, since it is larger than the sum of its proper divisors (15368591).

126615340321 is an equidigital number, since it uses as much as digits as its factorization.

126615340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15368590.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 126615340321 its reverse (123043516621), we get a palindrome (249658856942).

The spelling of 126615340321 in words is "one hundred twenty-six billion, six hundred fifteen million, three hundred forty thousand, three hundred twenty-one".