1211112101091 has 32 divisors (see below), whose sum is σ = 1631806160896. Its totient is φ = 798959700000.

The previous prime is 1211112101077. The next prime is 1211112101137. The reversal of 1211112101091 is 1901012111121.

It is a happy number.

It is not a de Polignac number, because 1211112101091 - 2⁷ = 1211112100963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211112101291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164751066 + ... + 164758416.

It is an arithmetic number, because the mean of its divisors is an integer number (50993942528).

Almost surely, 2^{1211112101091} is an apocalyptic number.

1211112101091 is a deficient number, since it is larger than the sum of its proper divisors (420694059805).

1211112101091 is a wasteful number, since it uses less digits than its factorization.

1211112101091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8863.

The product of its (nonzero) digits is 36, while the sum is 21.

The spelling of 1211112101091 in words is "one trillion, two hundred eleven billion, one hundred twelve million, one hundred one thousand, ninety-one".