111211100212021 has 8 divisors (see below), whose sum is σ = 113210573499288. Its totient is φ = 109217315328000.

The previous prime is 111211100212001. The next prime is 111211100212061. The reversal of 111211100212021 is 120212001112111.

It can be written as a sum of positive squares in 4 ways, for example, as 3259519711396 + 107951580500625 = 1805414^2 + 10389975^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111211100212021 - 2⁹ = 111211100211509 is a prime.

It is a super-2 number, since 2×111211100212021² (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 = 111211100211986 and 111211100212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211100212001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1422061360 + ... + 1422139561.

It is an arithmetic number, because the mean of its divisors is an integer number (14151321687411).

Almost surely, 2^{111211100212021} is an apocalyptic number.

It is an amenable number.

111211100212021 is a deficient number, since it is larger than the sum of its proper divisors (1999473287267).

111211100212021 is an equidigital number, since it uses as much as digits as its factorization.

111211100212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844201623.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111211100212021 its reverse (120212001112111), we get a palindrome (231423101324132).

The spelling of 111211100212021 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred million, two hundred twelve thousand, twenty-one".