127135888531721 has 4 divisors (see below), whose sum is σ = 128106391497744. Its totient is φ = 126165385565700.

The previous prime is 127135888531711. The next prime is 127135888531747.

127135888531721 is nontrivially palindromic in base 10.

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 127135888531721 - 2²² = 127135884337417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127135888531711) 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, 485251482815 + ... + 485251483076.

It is an arithmetic number, because the mean of its divisors is an integer number (32026597874436).

Almost surely, 2^{127135888531721} is an apocalyptic number.

It is an amenable number.

127135888531721 is a deficient number, since it is larger than the sum of its proper divisors (970502966023).

127135888531721 is an equidigital number, since it uses as much as digits as its factorization.

127135888531721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970502966022.

The product of its digits is 22579200, while the sum is 62.

The spelling of 127135888531721 in words is "one hundred twenty-seven trillion, one hundred thirty-five billion, eight hundred eighty-eight million, five hundred thirty-one thousand, seven hundred twenty-one".