200120200121 has 2 divisors, whose sum is σ = 200120200122. Its totient is φ = 200120200120.

The previous prime is 200120200117. The next prime is 200120200157. The reversal of 200120200121 is 121002021002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164478913600 + 35641286521 = 405560^2 + 188789^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120200121 - 2² = 200120200117 is a prime.

It is not a weakly prime, because it can be changed into another prime (200120200921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060100060 + 100060100061.

It is an arithmetic number, because the mean of its divisors is an integer number (100060100061).

Almost surely, 2^200120200121 is an apocalyptic number.

It is an amenable number.

200120200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

200120200121 is an equidigital number, since it uses as much as digits as its factorization.

200120200121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 200120200121 its reverse (121002021002), we get a palindrome (321122221123).

The spelling of 200120200121 in words is "two hundred billion, one hundred twenty million, two hundred thousand, one hundred twenty-one".