111221200021 has 8 divisors (see below), whose sum is σ = 113130155288. Its totient is φ = 109315008000.

The previous prime is 111221200009. The next prime is 111221200031. The reversal of 111221200021 is 120002122111.

It can be written as a sum of positive squares in 4 ways, for example, as 9851555025 + 101369644996 = 99255^2 + 318386^2 .

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-111221200021 is a prime.

It is a super-2 number, since 2×111221200021² (a number of 23 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 = 111221199974 and 111221200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221200031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609540 + ... + 770701.

It is an arithmetic number, because the mean of its divisors is an integer number (14141269411).

Almost surely, 2^111221200021 is an apocalyptic number.

It is an amenable number.

111221200021 is a deficient number, since it is larger than the sum of its proper divisors (1908955267).

111221200021 is a wasteful number, since it uses less digits than its factorization.

111221200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381623.

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

Adding to 111221200021 its reverse (120002122111), we get a palindrome (231223322132).

The spelling of 111221200021 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred thousand, twenty-one".