8420720611111 has 2 divisors, whose sum is σ = 8420720611112. Its totient is φ = 8420720611110.

The previous prime is 8420720611067. The next prime is 8420720611169. The reversal of 8420720611111 is 1111160270248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8420720611111 - 2¹³ = 8420720602919 is a prime.

It is a super-2 number, since 2×8420720611111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8420720612111) 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, 4210360305555 + 4210360305556.

It is an arithmetic number, because the mean of its divisors is an integer number (4210360305556).

Almost surely, 2^{8420720611111} is an apocalyptic number.

8420720611111 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420720611111 is an equidigital number, since it uses as much as digits as its factorization.

8420720611111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 34.

Adding to 8420720611111 its reverse (1111160270248), we get a palindrome (9531880881359).

The spelling of 8420720611111 in words is "eight trillion, four hundred twenty billion, seven hundred twenty million, six hundred eleven thousand, one hundred eleven".