111001122222121 has 16 divisors (see below), whose sum is σ = 112383674282880. Its totient is φ = 109625217108480.

The previous prime is 111001122222083. The next prime is 111001122222127. The reversal of 111001122222121 is 121222221100111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111001122222121 - 2¹¹ = 111001122220073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111001122222127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1597862430 + ... + 1597931896.

It is an arithmetic number, because the mean of its divisors is an integer number (7023979642680).

Almost surely, 2^{111001122222121} is an apocalyptic number.

It is an amenable number.

111001122222121 is a deficient number, since it is larger than the sum of its proper divisors (1382552060759).

111001122222121 is a wasteful number, since it uses less digits than its factorization.

111001122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117024.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111001122222121 its reverse (121222221100111), we get a palindrome (232223343322232).

The spelling of 111001122222121 in words is "one hundred eleven trillion, one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".