111020200121021 has 4 divisors (see below), whose sum is σ = 111020242701312. Its totient is φ = 111020157540732.

The previous prime is 111020200121011. The next prime is 111020200121041. The reversal of 111020200121021 is 120121002020111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111020200121021 is a prime.

It is a super-3 number, since 3×111020200121021³ (a number of 43 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 = 111020200120987 and 111020200121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020200121011) 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, 17104931 + ... + 22685216.

It is an arithmetic number, because the mean of its divisors is an integer number (27755060675328).

Almost surely, 2^{111020200121021} is an apocalyptic number.

It is an amenable number.

111020200121021 is a deficient number, since it is larger than the sum of its proper divisors (42580291).

111020200121021 is an equidigital number, since it uses as much as digits as its factorization.

111020200121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42580290.

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

Adding to 111020200121021 its reverse (120121002020111), we get a palindrome (231141202141132).

The spelling of 111020200121021 in words is "one hundred eleven trillion, twenty billion, two hundred million, one hundred twenty-one thousand, twenty-one".