111121202021 has 8 divisors (see below), whose sum is σ = 113250977400. Its totient is φ = 109011614400.

The previous prime is 111121201999. The next prime is 111121202039. The reversal of 111121202021 is 120202121111.

It can be written as a sum of positive squares in 4 ways, for example, as 16696516225 + 94424685796 = 129215^2 + 307286^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111121202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111121201987 and 111121202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121201021) 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, 5035826 + ... + 5057843.

It is an arithmetic number, because the mean of its divisors is an integer number (14156372175).

Almost surely, 2^111121202021 is an apocalyptic number.

It is an amenable number.

111121202021 is a deficient number, since it is larger than the sum of its proper divisors (2129775379).

111121202021 is a wasteful number, since it uses less digits than its factorization.

111121202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10093879.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111121202021 its reverse (120202121111), we get a palindrome (231323323132).

The spelling of 111121202021 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred two thousand, twenty-one".