1011921168889 has 2 divisors, whose sum is σ = 1011921168890. Its totient is φ = 1011921168888.

The previous prime is 1011921168883. The next prime is 1011921168913. The reversal of 1011921168889 is 9888611291101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972328128489 + 39593040400 = 986067^2 + 198980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011921168889 - 2²⁵ = 1011887614457 is a prime.

It is a super-2 number, since 2×1011921168889² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1011921168883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505960584444 + 505960584445.

It is an arithmetic number, because the mean of its divisors is an integer number (505960584445).

Almost surely, 2^{1011921168889} is an apocalyptic number.

It is an amenable number.

1011921168889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011921168889 is an equidigital number, since it uses as much as digits as its factorization.

1011921168889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 55.

The spelling of 1011921168889 in words is "one trillion, eleven billion, nine hundred twenty-one million, one hundred sixty-eight thousand, eight hundred eighty-nine".