1221100110211 has 2 divisors, whose sum is σ = 1221100110212. Its totient is φ = 1221100110210.

The previous prime is 1221100110203. The next prime is 1221100110221. The reversal of 1221100110211 is 1120110011221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100110211 - 2³ = 1221100110203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221100110191 and 1221100110200.

It is not a weakly prime, because it can be changed into another prime (1221100110221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550055105 + 610550055106.

It is an arithmetic number, because the mean of its divisors is an integer number (610550055106).

Almost surely, 2^{1221100110211} is an apocalyptic number.

1221100110211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100110211 is an equidigital number, since it uses as much as digits as its factorization.

1221100110211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221100110211 its reverse (1120110011221), we get a palindrome (2341210121432).

The spelling of 1221100110211 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred ten thousand, two hundred eleven".