200121011 has 4 divisors (see below), whose sum is σ = 204775032. Its totient is φ = 195466992.

The previous prime is 200121007. The next prime is 200121013. The reversal of 200121011 is 110121002.

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

It is not a de Polignac number, because 200121011 - 2² = 200121007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200121011.

It is not an unprimeable number, because it can be changed into a prime (200121013) 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, 2326946 + ... + 2327031.

It is an arithmetic number, because the mean of its divisors is an integer number (51193758).

Almost surely, 2^200121011 is an apocalyptic number.

200121011 is a deficient number, since it is larger than the sum of its proper divisors (4654021).

200121011 is an equidigital number, since it uses as much as digits as its factorization.

200121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4654020.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 200121011 is about 14146.4133616970. The cubic root of 200121011 is about 584.9214699661.

Adding to 200121011 its reverse (110121002), we get a palindrome (310242013).

Subtracting from 200121011 its reverse (110121002), we obtain a palindrome (90000009).

The spelling of 200121011 in words is "two hundred million, one hundred twenty-one thousand, eleven".