200121012121 has 4 divisors (see below), whose sum is σ = 200123722000. Its totient is φ = 200118302244.

The previous prime is 200121012101. The next prime is 200121012149. The reversal of 200121012121 is 121210121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200121012121 - 2¹⁷ = 200120881049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200121012101) 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, 1240971 + ... + 1392928.

It is an arithmetic number, because the mean of its divisors is an integer number (50030930500).

Almost surely, 2^200121012121 is an apocalyptic number.

It is an amenable number.

200121012121 is a deficient number, since it is larger than the sum of its proper divisors (2709879).

200121012121 is an equidigital number, since it uses as much as digits as its factorization.

200121012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709878.

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

Adding to 200121012121 its reverse (121210121002), we get a palindrome (321331133123).

The spelling of 200121012121 in words is "two hundred billion, one hundred twenty-one million, twelve thousand, one hundred twenty-one".