1221000210011 has 2 divisors, whose sum is σ = 1221000210012. Its totient is φ = 1221000210010.

The previous prime is 1221000209959. The next prime is 1221000210041. The reversal of 1221000210011 is 1100120001221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221000210011 - 2¹⁴ = 1221000193627 is a prime.

It is a super-2 number, since 2×1221000210011² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221000209974 and 1221000210001.

It is not a weakly prime, because it can be changed into another prime (1221000210041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500105005 + 610500105006.

It is an arithmetic number, because the mean of its divisors is an integer number (610500105006).

Almost surely, 2^{1221000210011} is an apocalyptic number.

1221000210011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221000210011 is an equidigital number, since it uses as much as digits as its factorization.

1221000210011 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 11.

Adding to 1221000210011 its reverse (1100120001221), we get a palindrome (2321120211232).

The spelling of 1221000210011 in words is "one trillion, two hundred twenty-one billion, two hundred ten thousand, eleven".