127120121021721 has 32 divisors (see below), whose sum is σ = 176007454560000. Its totient is φ = 81542583532800.

The previous prime is 127120121021717. The next prime is 127120121021791.

127120121021721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 127120121021721 - 2² = 127120121021717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127120121021701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2648655 + ... + 16163403.

It is an arithmetic number, because the mean of its divisors is an integer number (5500232955000).

Almost surely, 2^{127120121021721} is an apocalyptic number.

It is an amenable number.

127120121021721 is a deficient number, since it is larger than the sum of its proper divisors (48887333538279).

127120121021721 is a wasteful number, since it uses less digits than its factorization.

127120121021721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515729.

The product of its (nonzero) digits is 1568, while the sum is 30.

The spelling of 127120121021721 in words is "one hundred twenty-seven trillion, one hundred twenty billion, one hundred twenty-one million, twenty-one thousand, seven hundred twenty-one".