111021200021 has 4 divisors (see below), whose sum is σ = 111497686092. Its totient is φ = 110544713952.

The previous prime is 111021200011. The next prime is 111021200107. The reversal of 111021200021 is 120002120111.

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 67800868996 + 43220331025 = 260386^2 + 207895^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021200021 - 2³⁴ = 93841330837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021199975 and 111021200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021200011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238242686 + ... + 238243151.

It is an arithmetic number, because the mean of its divisors is an integer number (27874421523).

Almost surely, 2^111021200021 is an apocalyptic number.

It is an amenable number.

111021200021 is a deficient number, since it is larger than the sum of its proper divisors (476486071).

111021200021 is an equidigital number, since it uses as much as digits as its factorization.

111021200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476486070.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111021200021 its reverse (120002120111), we get a palindrome (231023320132).

The spelling of 111021200021 in words is "one hundred eleven billion, twenty-one million, two hundred thousand, twenty-one".