200121220001 has 2 divisors, whose sum is σ = 200121220002. Its totient is φ = 200121220000.

The previous prime is 200121219983. The next prime is 200121220069. The reversal of 200121220001 is 100022121002.

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., 128938446400 + 71182773601 = 359080^2 + 266801^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121220001 - 2¹⁸ = 200120957857 is a prime.

It is not a weakly prime, because it can be changed into another prime (200121220301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060610000 + 100060610001.

It is an arithmetic number, because the mean of its divisors is an integer number (100060610001).

Almost surely, 2^200121220001 is an apocalyptic number.

It is an amenable number.

200121220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121220001 is an equidigital number, since it uses as much as digits as its factorization.

200121220001 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 200121220001 its reverse (100022121002), we get a palindrome (300143341003).

The spelling of 200121220001 in words is "two hundred billion, one hundred twenty-one million, two hundred twenty thousand, one".