1021112011091 has 4 divisors (see below), whose sum is σ = 1027014392832. Its totient is φ = 1015209629352.

The previous prime is 1021112010973. The next prime is 1021112011099. The reversal of 1021112011091 is 1901102111201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021112011091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021112011099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2951190611 + ... + 2951190956.

It is an arithmetic number, because the mean of its divisors is an integer number (256753598208).

Almost surely, 2^{1021112011091} is an apocalyptic number.

1021112011091 is a deficient number, since it is larger than the sum of its proper divisors (5902381741).

1021112011091 is an equidigital number, since it uses as much as digits as its factorization.

1021112011091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5902381740.

The product of its (nonzero) digits is 36, while the sum is 20.

Adding to 1021112011091 its reverse (1901102111201), we get a palindrome (2922214122292).

The spelling of 1021112011091 in words is "one trillion, twenty-one billion, one hundred twelve million, eleven thousand, ninety-one".