111202012021 has 4 divisors (see below), whose sum is σ = 111202753932. Its totient is φ = 111201270112.

The previous prime is 111202011979. The next prime is 111202012037. The reversal of 111202012021 is 120210202111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120210202111 = 61 ⋅1970659051.

It can be written as a sum of positive squares in 2 ways, for example, as 27325743025 + 83876268996 = 165305^2 + 289614^2 .

It is a cyclic number.

It is not a de Polignac number, because 111202012021 - 2³⁵ = 76842273653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111202011992 and 111202012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111202015021) 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, 58270 + ... + 475183.

It is an arithmetic number, because the mean of its divisors is an integer number (27800688483).

Almost surely, 2^111202012021 is an apocalyptic number.

It is an amenable number.

111202012021 is a deficient number, since it is larger than the sum of its proper divisors (741911).

111202012021 is an equidigital number, since it uses as much as digits as its factorization.

111202012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741910.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111202012021 its reverse (120210202111), we get a palindrome (231412214132).

The spelling of 111202012021 in words is "one hundred eleven billion, two hundred two million, twelve thousand, twenty-one".