1221000200201 has 2 divisors, whose sum is σ = 1221000200202. Its totient is φ = 1221000200200.

The previous prime is 1221000200177. The next prime is 1221000200209. The reversal of 1221000200201 is 1020020001221.

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., 680262048400 + 540738151801 = 824780^2 + 735349^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221000200201 - 2²⁶ = 1220933091337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221000200209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500100100 + 610500100101.

It is an arithmetic number, because the mean of its divisors is an integer number (610500100101).

Almost surely, 2^{1221000200201} is an apocalyptic number.

It is an amenable number.

1221000200201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221000200201 is an equidigital number, since it uses as much as digits as its factorization.

1221000200201 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 1221000200201 its reverse (1020020001221), we get a palindrome (2241020201422).

The spelling of 1221000200201 in words is "one trillion, two hundred twenty-one billion, two hundred thousand, two hundred one".