111112100021 has 16 divisors (see below), whose sum is σ = 123669611520. Its totient is φ = 99135567360.

The previous prime is 111112100009. The next prime is 111112100101. The reversal of 111112100021 is 120001211111.

It is a cyclic number.

It is not a de Polignac number, because 111112100021 - 2⁶ = 111112099957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111112099975 and 111112100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112100321) 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, 164165 + ... + 499173.

It is an arithmetic number, because the mean of its divisors is an integer number (7729350720).

Almost surely, 2^111112100021 is an apocalyptic number.

It is an amenable number.

111112100021 is a deficient number, since it is larger than the sum of its proper divisors (12557511499).

111112100021 is a wasteful number, since it uses less digits than its factorization.

111112100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335876.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111112100021 its reverse (120001211111), we get a palindrome (231113311132).

The spelling of 111112100021 in words is "one hundred eleven billion, one hundred twelve million, one hundred thousand, twenty-one".