111012101210021 has 6 divisors (see below), whose sum is σ = 122021565792966. Its totient is φ = 100920092009000.

The previous prime is 111012101210009. The next prime is 111012101210039. The reversal of 111012101210021 is 120012101210111.

It can be written as a sum of positive squares in only one way, i.e., 103349385888100 + 7662715321921 = 10166090^2 + 2768161^2 .

It is not a de Polignac number, because 111012101210021 - 2³⁴ = 110994921340837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111012101209978 and 111012101210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012101210321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 458727690830 + ... + 458727691071.

It is an arithmetic number, because the mean of its divisors is an integer number (20336927632161).

Almost surely, 2^{111012101210021} is an apocalyptic number.

111012101210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111012101210021 is a deficient number, since it is larger than the sum of its proper divisors (11009464582945).

111012101210021 is an equidigital number, since it uses as much as digits as its factorization.

111012101210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917455381923 (or 917455381912 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111012101210021 its reverse (120012101210111), we get a palindrome (231024202420132).

The spelling of 111012101210021 in words is "one hundred eleven trillion, twelve billion, one hundred one million, two hundred ten thousand, twenty-one".