111021000091 has 2 divisors, whose sum is σ = 111021000092. Its totient is φ = 111021000090.

The previous prime is 111021000007. The next prime is 111021000157. The reversal of 111021000091 is 190000120111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111021000091 - 2¹³ = 111020991899 is a prime.

It is a super-2 number, since 2×111021000091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111021000191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510500045 + 55510500046.

It is an arithmetic number, because the mean of its divisors is an integer number (55510500046).

Almost surely, 2^111021000091 is an apocalyptic number.

111021000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021000091 is an equidigital number, since it uses as much as digits as its factorization.

111021000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 111021000091 in words is "one hundred eleven billion, twenty-one million, ninety-one", and thus it is an aban number.