200121202111 has 4 divisors (see below), whose sum is σ = 200126603592. Its totient is φ = 200115800632.

The previous prime is 200121202109. The next prime is 200121202117. The reversal of 200121202111 is 111202121002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 200121202111 - 2¹ = 200121202109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121202091 and 200121202100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121202117) 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, 2644780 + ... + 2719393.

It is an arithmetic number, because the mean of its divisors is an integer number (50031650898).

Almost surely, 2^200121202111 is an apocalyptic number.

200121202111 is a deficient number, since it is larger than the sum of its proper divisors (5401481).

200121202111 is an equidigital number, since it uses as much as digits as its factorization.

200121202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401480.

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

Adding to 200121202111 its reverse (111202121002), we get a palindrome (311323323113).

The spelling of 200121202111 in words is "two hundred billion, one hundred twenty-one million, two hundred two thousand, one hundred eleven".