111231223130021 has 4 divisors (see below), whose sum is σ = 111262653261600. Its totient is φ = 111199792998444.

The previous prime is 111231223129997. The next prime is 111231223130023. The reversal of 111231223130021 is 120031322132111.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-111231223130021 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 (111231223130023) 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, 15715060481 + ... + 15715067558.

It is an arithmetic number, because the mean of its divisors is an integer number (27815663315400).

Almost surely, 2^{111231223130021} is an apocalyptic number.

It is an amenable number.

111231223130021 is a deficient number, since it is larger than the sum of its proper divisors (31430131579).

111231223130021 is an equidigital number, since it uses as much as digits as its factorization.

111231223130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430131578.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 111231223130021 its reverse (120031322132111), we get a palindrome (231262545262132).

The spelling of 111231223130021 in words is "one hundred eleven trillion, two hundred thirty-one billion, two hundred twenty-three million, one hundred thirty thousand, twenty-one".