127120222021721 has 4 divisors (see below), whose sum is σ = 128378838081444. Its totient is φ = 125861605962000.

The previous prime is 127120222021703. The next prime is 127120222021733.

It is a happy number.

127120222021721 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119087872482121 + 8032349539600 = 10912739^2 + 2834140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127120222021721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127120222021781) 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, 629308029710 + ... + 629308029911.

It is an arithmetic number, because the mean of its divisors is an integer number (32094709520361).

Almost surely, 2^{127120222021721} is an apocalyptic number.

It is an amenable number.

127120222021721 is a deficient number, since it is larger than the sum of its proper divisors (1258616059723).

127120222021721 is a wasteful number, since it uses less digits than its factorization.

127120222021721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258616059722.

The product of its (nonzero) digits is 6272, while the sum is 32.

The spelling of 127120222021721 in words is "one hundred twenty-seven trillion, one hundred twenty billion, two hundred twenty-two million, twenty-one thousand, seven hundred twenty-one".