1221011022167 has 2 divisors, whose sum is σ = 1221011022168. Its totient is φ = 1221011022166.

The previous prime is 1221011022163. The next prime is 1221011022239. The reversal of 1221011022167 is 7612201101221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221011022167 - 2² = 1221011022163 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221011022163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505511083 + 610505511084.

It is an arithmetic number, because the mean of its divisors is an integer number (610505511084).

Almost surely, 2^{1221011022167} is an apocalyptic number.

1221011022167 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011022167 is an equidigital number, since it uses as much as digits as its factorization.

1221011022167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

Adding to 1221011022167 its reverse (7612201101221), we get a palindrome (8833212123388).

The spelling of 1221011022167 in words is "one trillion, two hundred twenty-one billion, eleven million, twenty-two thousand, one hundred sixty-seven".