111211320311021 has 4 divisors (see below), whose sum is σ = 127098651784032. Its totient is φ = 95323988838012.

The previous prime is 111211320310963. The next prime is 111211320311053. The reversal of 111211320311021 is 120113023112111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111211320311021 - 2²⁶ = 111211253202157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111211320310984 and 111211320311002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211320310021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7943665736495 + ... + 7943665736508.

It is an arithmetic number, because the mean of its divisors is an integer number (31774662946008).

Almost surely, 2^{111211320311021} is an apocalyptic number.

It is an amenable number.

111211320311021 is a deficient number, since it is larger than the sum of its proper divisors (15887331473011).

111211320311021 is an equidigital number, since it uses as much as digits as its factorization.

111211320311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15887331473010.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 111211320311021 its reverse (120113023112111), we get a palindrome (231324343423132).

The spelling of 111211320311021 in words is "one hundred eleven trillion, two hundred eleven billion, three hundred twenty million, three hundred eleven thousand, twenty-one".