111112001021 has 4 divisors (see below), whose sum is σ = 126985144032. Its totient is φ = 95238858012.

The previous prime is 111112000991. The next prime is 111112001023. The reversal of 111112001021 is 120100211111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111112001021 - 2⁶ = 111112000957 is a prime.

It is a super-4 number, since 4×111112001021⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111112000993 and 111112001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112001023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7936571495 + ... + 7936571508.

It is an arithmetic number, because the mean of its divisors is an integer number (31746286008).

Almost surely, 2^111112001021 is an apocalyptic number.

It is an amenable number.

111112001021 is a deficient number, since it is larger than the sum of its proper divisors (15873143011).

111112001021 is an equidigital number, since it uses as much as digits as its factorization.

111112001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15873143010.

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

Adding to 111112001021 its reverse (120100211111), we get a palindrome (231212212132).

The spelling of 111112001021 in words is "one hundred eleven billion, one hundred twelve million, one thousand, twenty-one".