111012211021 has 4 divisors (see below), whose sum is σ = 111472842844. Its totient is φ = 110551579200.

The previous prime is 111012210977. The next prime is 111012211087. The reversal of 111012211021 is 120112210111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38712530025 + 72299680996 = 196755^2 + 268886^2 .

It is a cyclic number.

It is not a de Polignac number, because 111012211021 - 2⁷ = 111012210893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111012210992 and 111012211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111018211021) 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, 230315550 + ... + 230316031.

It is an arithmetic number, because the mean of its divisors is an integer number (27868210711).

Almost surely, 2^111012211021 is an apocalyptic number.

It is an amenable number.

111012211021 is a deficient number, since it is larger than the sum of its proper divisors (460631823).

111012211021 is an equidigital number, since it uses as much as digits as its factorization.

111012211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460631822.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111012211021 its reverse (120112210111), we get a palindrome (231124421132).

The spelling of 111012211021 in words is "one hundred eleven billion, twelve million, two hundred eleven thousand, twenty-one".