21220111001267 has 2 divisors, whose sum is σ = 21220111001268. Its totient is φ = 21220111001266.

The previous prime is 21220111001191. The next prime is 21220111001281. The reversal of 21220111001267 is 76210011102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220111001267 - 2¹⁴ = 21220110984883 is a prime.

It is a super-2 number, since 2×21220111001267² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220111007267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610055500633 + 10610055500634.

It is an arithmetic number, because the mean of its divisors is an integer number (10610055500634).

Almost surely, 2^{21220111001267} is an apocalyptic number.

21220111001267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220111001267 is an equidigital number, since it uses as much as digits as its factorization.

21220111001267 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 21220111001267 its reverse (76210011102212), we get a palindrome (97430122103479).

The spelling of 21220111001267 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one thousand, two hundred sixty-seven".