1221001002211 has 2 divisors, whose sum is σ = 1221001002212. Its totient is φ = 1221001002210.

The previous prime is 1221001002203. The next prime is 1221001002223. The reversal of 1221001002211 is 1122001001221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221001002211 - 2³ = 1221001002203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221001002191 and 1221001002200.

It is not a weakly prime, because it can be changed into another prime (1221001402211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500501105 + 610500501106.

It is an arithmetic number, because the mean of its divisors is an integer number (610500501106).

Almost surely, 2^{1221001002211} is an apocalyptic number.

1221001002211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221001002211 is an equidigital number, since it uses as much as digits as its factorization.

1221001002211 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 13.

Adding to 1221001002211 its reverse (1122001001221), we get a palindrome (2343002003432).

The spelling of 1221001002211 in words is "one trillion, two hundred twenty-one billion, one million, two thousand, two hundred eleven".