1221101220011 has 2 divisors, whose sum is σ = 1221101220012. Its totient is φ = 1221101220010.

The previous prime is 1221101219999. The next prime is 1221101220037. The reversal of 1221101220011 is 1100221011221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221101220011 - 2³⁸ = 946223313067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221101220041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550610005 + 610550610006.

It is an arithmetic number, because the mean of its divisors is an integer number (610550610006).

Almost surely, 2^{1221101220011} is an apocalyptic number.

1221101220011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101220011 is an equidigital number, since it uses as much as digits as its factorization.

1221101220011 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 14.

Adding to 1221101220011 its reverse (1100221011221), we get a palindrome (2321322231232).

The spelling of 1221101220011 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, eleven".