111012210021 has 12 divisors (see below), whose sum is σ = 154731576608. Its totient is φ = 70790393784.

The previous prime is 111012210011. The next prime is 111012210031. The reversal of 111012210021 is 120012210111.

It is an interprime number because it is at equal distance from previous prime (111012210011) and next prime (111012210031).

It is not a de Polignac number, because 111012210021 - 2¹⁵ = 111012177253 is a prime.

It is a super-2 number, since 2×111012210021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111012209979 and 111012210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012210011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34973905 + ... + 34977078.

Almost surely, 2^111012210021 is an apocalyptic number.

It is an amenable number.

111012210021 is a deficient number, since it is larger than the sum of its proper divisors (43719366587).

111012210021 is an equidigital number, since it uses as much as digits as its factorization.

111012210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69951032 (or 69951009 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111012210021 its reverse (120012210111), we get a palindrome (231024420132).

The spelling of 111012210021 in words is "one hundred eleven billion, twelve million, two hundred ten thousand, twenty-one".