1272827372921 has 4 divisors (see below), whose sum is σ = 1370737170852. Its totient is φ = 1174917574992.

The previous prime is 1272827372909. The next prime is 1272827372951. The reversal of 1272827372921 is 1292737282721.

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 237816176896 + 1035011196025 = 487664^2 + 1017355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272827372921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272827372951) 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, 48954898946 + ... + 48954898971.

It is an arithmetic number, because the mean of its divisors is an integer number (342684292713).

Almost surely, 2^{1272827372921} is an apocalyptic number.

It is an amenable number.

1272827372921 is a deficient number, since it is larger than the sum of its proper divisors (97909797931).

1272827372921 is an equidigital number, since it uses as much as digits as its factorization.

1272827372921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97909797930.

The product of its digits is 2370816, while the sum is 53.

The spelling of 1272827372921 in words is "one trillion, two hundred seventy-two billion, eight hundred twenty-seven million, three hundred seventy-two thousand, nine hundred twenty-one".