200111110021 has 4 divisors (see below), whose sum is σ = 204991868844. Its totient is φ = 195230351200.

The previous prime is 200111109973. The next prime is 200111110049. The reversal of 200111110021 is 120011111002.

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 7311960100 + 192799149921 = 85510^2 + 439089^2 .

It is a cyclic number.

It is not a de Polignac number, because 200111110021 - 2¹⁵ = 200111077253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200111110051) 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, 2440379350 + ... + 2440379431.

It is an arithmetic number, because the mean of its divisors is an integer number (51247967211).

Almost surely, 2^200111110021 is an apocalyptic number.

It is an amenable number.

200111110021 is a deficient number, since it is larger than the sum of its proper divisors (4880758823).

200111110021 is an equidigital number, since it uses as much as digits as its factorization.

200111110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4880758822.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 200111110021 its reverse (120011111002), we get a palindrome (320122221023).

The spelling of 200111110021 in words is "two hundred billion, one hundred eleven million, one hundred ten thousand, twenty-one".