200121121099 has 4 divisors (see below), whose sum is σ = 200122845736. Its totient is φ = 200119396464.

The previous prime is 200121121087. The next prime is 200121121157. The reversal of 200121121099 is 990121121002.

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 200121121099 - 2²⁷ = 199986903371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200121121049) 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, 674649 + ... + 924874.

It is an arithmetic number, because the mean of its divisors is an integer number (50030711434).

Almost surely, 2^200121121099 is an apocalyptic number.

200121121099 is a deficient number, since it is larger than the sum of its proper divisors (1724637).

200121121099 is a wasteful number, since it uses less digits than its factorization.

200121121099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724636.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 200121121099 in words is "two hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, ninety-nine".