200120000001221 has 2 divisors, whose sum is σ = 200120000001222. Its totient is φ = 200120000001220.

The previous prime is 200120000001137. The next prime is 200120000001227. The reversal of 200120000001221 is 122100000021002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196858129216996 + 3261870784225 = 14030614^2 + 1806065^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120000001221 - 2¹⁴ = 200119999984837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200120000001227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060000000610 + 100060000000611.

It is an arithmetic number, because the mean of its divisors is an integer number (100060000000611).

Almost surely, 2^{200120000001221} is an apocalyptic number.

It is an amenable number.

200120000001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

200120000001221 is an equidigital number, since it uses as much as digits as its factorization.

200120000001221 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 200120000001221 its reverse (122100000021002), we get a palindrome (322220000022223).

The spelling of 200120000001221 in words is "two hundred trillion, one hundred twenty billion, one thousand, two hundred twenty-one".