111222122021 has 4 divisors (see below), whose sum is σ = 111683624844. Its totient is φ = 110760619200.

The previous prime is 111222122009. The next prime is 111222122101. The reversal of 111222122021 is 120221222111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27924081025 + 83298040996 = 167105^2 + 288614^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222122021 - 2¹⁴ = 111222105637 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 (111222152021) 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, 230751050 + ... + 230751531.

It is an arithmetic number, because the mean of its divisors is an integer number (27920906211).

Almost surely, 2^111222122021 is an apocalyptic number.

It is an amenable number.

111222122021 is a deficient number, since it is larger than the sum of its proper divisors (461502823).

111222122021 is an equidigital number, since it uses as much as digits as its factorization.

111222122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461502822.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111222122021 its reverse (120221222111), we get a palindrome (231443344132).

The spelling of 111222122021 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, twenty-one".