1221100001267 has 2 divisors, whose sum is σ = 1221100001268. Its totient is φ = 1221100001266.

The previous prime is 1221100001203. The next prime is 1221100001291. The reversal of 1221100001267 is 7621000011221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100001267 - 2⁶ = 1221100001203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221100001767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550000633 + 610550000634.

It is an arithmetic number, because the mean of its divisors is an integer number (610550000634).

Almost surely, 2^{1221100001267} is an apocalyptic number.

1221100001267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100001267 is an equidigital number, since it uses as much as digits as its factorization.

1221100001267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 1221100001267 its reverse (7621000011221), we get a palindrome (8842100012488).

The spelling of 1221100001267 in words is "one trillion, two hundred twenty-one billion, one hundred million, one thousand, two hundred sixty-seven".