11312021111 has 4 divisors (see below), whose sum is σ = 11471345424. Its totient is φ = 11152696800.

The previous prime is 11312021101. The next prime is 11312021131. The reversal of 11312021111 is 11112021311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112021311 = 4001 ⋅2777311.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11312021111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312021101) 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, 79662050 + ... + 79662191.

It is an arithmetic number, because the mean of its divisors is an integer number (2867836356).

Almost surely, 2^11312021111 is an apocalyptic number.

11312021111 is a deficient number, since it is larger than the sum of its proper divisors (159324313).

11312021111 is an equidigital number, since it uses as much as digits as its factorization.

11312021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159324312.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11312021111 its reverse (11112021311), we get a palindrome (22424042422).

The spelling of 11312021111 in words is "eleven billion, three hundred twelve million, twenty-one thousand, one hundred eleven".