11211112291 has 4 divisors (see below), whose sum is σ = 11597702400. Its totient is φ = 10824522184.

The previous prime is 11211112277. The next prime is 11211112301. The reversal of 11211112291 is 19221111211.

It is a happy number.

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-11211112291 is a prime.

It is a super-3 number, since 3×11211112291³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211112261) 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, 193295011 + ... + 193295068.

It is an arithmetic number, because the mean of its divisors is an integer number (2899425600).

Almost surely, 2^11211112291 is an apocalyptic number.

11211112291 is a deficient number, since it is larger than the sum of its proper divisors (386590109).

11211112291 is an equidigital number, since it uses as much as digits as its factorization.

11211112291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386590108.

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

The spelling of 11211112291 in words is "eleven billion, two hundred eleven million, one hundred twelve thousand, two hundred ninety-one".