111221231130021 has 4 divisors (see below), whose sum is σ = 148294974840032. Its totient is φ = 74147487420012.

The previous prime is 111221231129951. The next prime is 111221231130041. The reversal of 111221231130021 is 120031132122111.

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 not a de Polignac number, because 111221231130021 - 2²³ = 111221222741413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111221231130021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221231130041) 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, 18536871855001 + ... + 18536871855006.

It is an arithmetic number, because the mean of its divisors is an integer number (37073743710008).

Almost surely, 2^{111221231130021} is an apocalyptic number.

It is an amenable number.

111221231130021 is a deficient number, since it is larger than the sum of its proper divisors (37073743710011).

111221231130021 is an equidigital number, since it uses as much as digits as its factorization.

111221231130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37073743710010.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 111221231130021 its reverse (120031132122111), we get a palindrome (231252363252132).

The spelling of 111221231130021 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred thirty-one million, one hundred thirty thousand, twenty-one".