1221221000011 has 2 divisors, whose sum is σ = 1221221000012. Its totient is φ = 1221221000010.

The previous prime is 1221220999969. The next prime is 1221221000029. The reversal of 1221221000011 is 1100001221221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221221000011 - 2¹¹ = 1221220997963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221220999955 and 1221221000000.

It is not a weakly prime, because it can be changed into another prime (1221221000071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610500005 + 610610500006.

It is an arithmetic number, because the mean of its divisors is an integer number (610610500006).

Almost surely, 2^{1221221000011} is an apocalyptic number.

1221221000011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221000011 is an equidigital number, since it uses as much as digits as its factorization.

1221221000011 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 1221221000011 its reverse (1100001221221), we get a palindrome (2321222221232).

The spelling of 1221221000011 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, eleven", and thus it is an aban number.