111020200021 has 4 divisors (see below), whose sum is σ = 111595434412. Its totient is φ = 110444965632.

The previous prime is 111020199959. The next prime is 111020200061. The reversal of 111020200021 is 120002020111.

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 52594542225 + 58425657796 = 229335^2 + 241714^2 .

It is a cyclic number.

It is not a de Polignac number, because 111020200021 - 2¹¹ = 111020197973 is a prime.

It is a super-3 number, since 3×111020200021³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111020199980 and 111020200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020200061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287616906 + ... + 287617291.

It is an arithmetic number, because the mean of its divisors is an integer number (27898858603).

Almost surely, 2^111020200021 is an apocalyptic number.

It is an amenable number.

111020200021 is a deficient number, since it is larger than the sum of its proper divisors (575234391).

111020200021 is an equidigital number, since it uses as much as digits as its factorization.

111020200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575234390.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 111020200021 its reverse (120002020111), we get a palindrome (231022220132).

The spelling of 111020200021 in words is "one hundred eleven billion, twenty million, two hundred thousand, twenty-one".