1272994992721 has 4 divisors (see below), whose sum is σ = 1339994729200. Its totient is φ = 1205995256244.

The previous prime is 1272994992713. The next prime is 1272994992751.

1272994992721 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 1272994992721 - 2³ = 1272994992713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272994992751) 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, 33499868211 + ... + 33499868248.

It is an arithmetic number, because the mean of its divisors is an integer number (334998682300).

Almost surely, 2^{1272994992721} is an apocalyptic number.

It is an amenable number.

1272994992721 is a deficient number, since it is larger than the sum of its proper divisors (66999736479).

1272994992721 is an equidigital number, since it uses as much as digits as its factorization.

1272994992721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66999736478.

The product of its digits is 20575296, while the sum is 64.

The spelling of 1272994992721 in words is "one trillion, two hundred seventy-two billion, nine hundred ninety-four million, nine hundred ninety-two thousand, seven hundred twenty-one".