111001210102021 has 4 divisors (see below), whose sum is σ = 111003772914252. Its totient is φ = 110998647289792.

The previous prime is 111001210101989. The next prime is 111001210102067. The reversal of 111001210102021 is 120201012100111.

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 80843385777025 + 30157824324996 = 8991295^2 + 5491614^2 .

It is a cyclic number.

It is not a de Polignac number, because 111001210102021 - 2⁵ = 111001210101989 is a prime.

It is a super-2 number, since 2×111001210102021² (a number of 29 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 = 111001210101992 and 111001210102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001210102091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281341146 + ... + 1281427771.

It is an arithmetic number, because the mean of its divisors is an integer number (27750943228563).

Almost surely, 2^{111001210102021} is an apocalyptic number.

It is an amenable number.

111001210102021 is a deficient number, since it is larger than the sum of its proper divisors (2562812231).

111001210102021 is an equidigital number, since it uses as much as digits as its factorization.

111001210102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562812230.

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

Adding to 111001210102021 its reverse (120201012100111), we get a palindrome (231202222202132).

The spelling of 111001210102021 in words is "one hundred eleven trillion, one billion, two hundred ten million, one hundred two thousand, twenty-one".