1111201021291 has 2 divisors, whose sum is σ = 1111201021292. Its totient is φ = 1111201021290.

The previous prime is 1111201021289. The next prime is 1111201021297. The reversal of 1111201021291 is 1921201021111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1111201021291 - 2¹ = 1111201021289 is a prime.

It is a super-2 number, since 2×1111201021291² (a number of 25 digits) contains 22 as substring.

Together with 1111201021289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1111201021297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555600510645 + 555600510646.

It is an arithmetic number, because the mean of its divisors is an integer number (555600510646).

Almost surely, 2^{1111201021291} is an apocalyptic number.

1111201021291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111201021291 is an equidigital number, since it uses as much as digits as its factorization.

1111201021291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 1111201021291 in words is "one trillion, one hundred eleven billion, two hundred one million, twenty-one thousand, two hundred ninety-one".