111221222112021 has 24 divisors (see below), whose sum is σ = 172512271769760. Its totient is φ = 63552815370912.

The previous prime is 111221222111869. The next prime is 111221222112059. The reversal of 111221222112021 is 120211222122111.

It is not a de Polignac number, because 111221222112021 - 2¹⁰ = 111221222110997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221222112061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8581386 + ... + 17207051.

It is an arithmetic number, because the mean of its divisors is an integer number (7188011323740).

Almost surely, 2^{111221222112021} is an apocalyptic number.

It is an amenable number.

111221222112021 is a deficient number, since it is larger than the sum of its proper divisors (61291049657739).

111221222112021 is a wasteful number, since it uses less digits than its factorization.

111221222112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25817793 (or 25817786 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111221222112021 its reverse (120211222122111), we get a palindrome (231432444234132).

The spelling of 111221222112021 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, twenty-one".