111212210221 has 4 divisors (see below), whose sum is σ = 127099668832. Its totient is φ = 95324751612.

The previous prime is 111212210209. The next prime is 111212210231. The reversal of 111212210221 is 122012212111.

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 111212210221 - 2²⁵ = 111178655789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212210195 and 111212210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212210231) 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, 7943729295 + ... + 7943729308.

It is an arithmetic number, because the mean of its divisors is an integer number (31774917208).

Almost surely, 2^111212210221 is an apocalyptic number.

It is an amenable number.

111212210221 is a deficient number, since it is larger than the sum of its proper divisors (15887458611).

111212210221 is an equidigital number, since it uses as much as digits as its factorization.

111212210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15887458610.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111212210221 its reverse (122012212111), we get a palindrome (233224422332).

The spelling of 111212210221 in words is "one hundred eleven billion, two hundred twelve million, two hundred ten thousand, two hundred twenty-one".