111111211112021 has 8 divisors (see below), whose sum is σ = 111918016482720. Its totient is φ = 110307202294608.

The previous prime is 111111211111993. The next prime is 111111211112023. The reversal of 111111211112021 is 120211112111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111111211112021 - 2²⁶ = 111111144003157 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 (111111211112023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699058571 + ... + 699217496.

It is an arithmetic number, because the mean of its divisors is an integer number (13989752060340).

Almost surely, 2^{111111211112021} is an apocalyptic number.

It is an amenable number.

111111211112021 is a deficient number, since it is larger than the sum of its proper divisors (806805370699).

111111211112021 is a wasteful number, since it uses less digits than its factorization.

111111211112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398276643.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111111211112021 its reverse (120211112111111), we get a palindrome (231322323223132).

The spelling of 111111211112021 in words is "one hundred eleven trillion, one hundred eleven billion, two hundred eleven million, one hundred twelve thousand, twenty-one".