1221002201 has 2 divisors, whose sum is σ = 1221002202. Its totient is φ = 1221002200.

The previous prime is 1221002197. The next prime is 1221002207. The reversal of 1221002201 is 1022001221.

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., 1107558400 + 113443801 = 33280^2 + 10651^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221002201 - 2² = 1221002197 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221002207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501100 + 610501101.

It is an arithmetic number, because the mean of its divisors is an integer number (610501101).

Almost surely, 2^1221002201 is an apocalyptic number.

It is an amenable number.

1221002201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002201 is an equidigital number, since it uses as much as digits as its factorization.

1221002201 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.

The square root of 1221002201 is about 34942.8419136166. The cubic root of 1221002201 is about 1068.8222406580.

Adding to 1221002201 its reverse (1022001221), we get a palindrome (2243003422).

The spelling of 1221002201 in words is "one billion, two hundred twenty-one million, two thousand, two hundred one".