1221002011211 has 2 divisors, whose sum is σ = 1221002011212. Its totient is φ = 1221002011210.

The previous prime is 1221002011153. The next prime is 1221002011249. The reversal of 1221002011211 is 1121102001221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002011211 - 2³⁰ = 1219928269387 is a prime.

It is a super-2 number, since 2×1221002011211² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221002011111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501005605 + 610501005606.

It is an arithmetic number, because the mean of its divisors is an integer number (610501005606).

Almost surely, 2^{1221002011211} is an apocalyptic number.

1221002011211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002011211 is an equidigital number, since it uses as much as digits as its factorization.

1221002011211 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 1221002011211 its reverse (1121102001221), we get a palindrome (2342104012432).

The spelling of 1221002011211 in words is "one trillion, two hundred twenty-one billion, two million, eleven thousand, two hundred eleven".