2111913121291 has 16 divisors (see below), whose sum is σ = 2166919221600. Its totient is φ = 2057596915968.

The previous prime is 2111913121277. The next prime is 2111913121303. The reversal of 2111913121291 is 1921213191112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2111913121291 - 2⁷ = 2111913121163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111913121091) 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, 4741765 + ... + 5167993.

It is an arithmetic number, because the mean of its divisors is an integer number (135432451350).

Almost surely, 2^{2111913121291} is an apocalyptic number.

2111913121291 is a deficient number, since it is larger than the sum of its proper divisors (55006100309).

2111913121291 is a wasteful number, since it uses less digits than its factorization.

2111913121291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427038.

The product of its digits is 1944, while the sum is 34.

The spelling of 2111913121291 in words is "two trillion, one hundred eleven billion, nine hundred thirteen million, one hundred twenty-one thousand, two hundred ninety-one".