111212311021 has 16 divisors (see below), whose sum is σ = 128086824960. Its totient is φ = 94585993200.

The previous prime is 111212311019. The next prime is 111212311037. The reversal of 111212311021 is 120113212111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111212311021 - 2¹ = 111212311019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212310986 and 111212311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212311321) 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, 878250 + ... + 996868.

It is an arithmetic number, because the mean of its divisors is an integer number (8005426560).

Almost surely, 2^111212311021 is an apocalyptic number.

It is an amenable number.

111212311021 is a deficient number, since it is larger than the sum of its proper divisors (16874513939).

111212311021 is a wasteful number, since it uses less digits than its factorization.

111212311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119664.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111212311021 its reverse (120113212111), we get a palindrome (231325523132).

The spelling of 111212311021 in words is "one hundred eleven billion, two hundred twelve million, three hundred eleven thousand, twenty-one".