21211222218007 has 2 divisors, whose sum is σ = 21211222218008. Its totient is φ = 21211222218006.

The previous prime is 21211222217981. The next prime is 21211222218037. The reversal of 21211222218007 is 70081222211212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211222218007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211222218007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211222218037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605611109003 + 10605611109004.

It is an arithmetic number, because the mean of its divisors is an integer number (10605611109004).

Almost surely, 2^{21211222218007} is an apocalyptic number.

21211222218007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211222218007 is an equidigital number, since it uses as much as digits as its factorization.

21211222218007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

Adding to 21211222218007 its reverse (70081222211212), we get a palindrome (91292444429219).

The spelling of 21211222218007 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred eighteen thousand, seven".