1277867322721 has 16 divisors (see below), whose sum is σ = 1412370137088. Its totient is φ = 1146515806800.

The previous prime is 1277867322703. The next prime is 1277867322769. The reversal of 1277867322721 is 1272237687721.

It is a cyclic number.

It is not a de Polignac number, because 1277867322721 - 2⁵ = 1277867322689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1277867323721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2127735 + ... + 2661388.

It is an arithmetic number, because the mean of its divisors is an integer number (88273133568).

Almost surely, 2^{1277867322721} is an apocalyptic number.

1277867322721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1277867322721 is a deficient number, since it is larger than the sum of its proper divisors (134502814367).

1277867322721 is a wasteful number, since it uses less digits than its factorization.

1277867322721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4789452.

The product of its digits is 5531904, while the sum is 55.

The spelling of 1277867322721 in words is "one trillion, two hundred seventy-seven billion, eight hundred sixty-seven million, three hundred twenty-two thousand, seven hundred twenty-one".