200121011212009 has 4 divisors (see below), whose sum is σ = 202862394927316. Its totient is φ = 197379627496704.

The previous prime is 200121011211991. The next prime is 200121011212069. The reversal of 200121011212009 is 900212110121002.

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 55386757603984 + 144734253608025 = 7442228^2 + 12030555^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121011212009 - 2²¹ = 200121009114857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200121011212069) 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, 1370691857544 + ... + 1370691857689.

It is an arithmetic number, because the mean of its divisors is an integer number (50715598731829).

Almost surely, 2^{200121011212009} is an apocalyptic number.

It is an amenable number.

200121011212009 is a deficient number, since it is larger than the sum of its proper divisors (2741383715307).

200121011212009 is an equidigital number, since it uses as much as digits as its factorization.

200121011212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741383715306.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 200121011212009 in words is "two hundred trillion, one hundred twenty-one billion, eleven million, two hundred twelve thousand, nine".