11267978765921 has 2 divisors, whose sum is σ = 11267978765922. Its totient is φ = 11267978765920.

The previous prime is 11267978765863. The next prime is 11267978765977. The reversal of 11267978765921 is 12956787976211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9342436771600 + 1925541994321 = 3056540^2 + 1387639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11267978765921 is a prime.

It is a super-2 number, since 2×11267978765921² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11267978764921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5633989382960 + 5633989382961.

It is an arithmetic number, because the mean of its divisors is an integer number (5633989382961).

Almost surely, 2^{11267978765921} is an apocalyptic number.

It is an amenable number.

11267978765921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11267978765921 is an equidigital number, since it uses as much as digits as its factorization.

11267978765921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160030080, while the sum is 71.

The spelling of 11267978765921 in words is "eleven trillion, two hundred sixty-seven billion, nine hundred seventy-eight million, seven hundred sixty-five thousand, nine hundred twenty-one".