78020120210111 has 2 divisors, whose sum is σ = 78020120210112. Its totient is φ = 78020120210110.

The previous prime is 78020120210101. The next prime is 78020120210119. The reversal of 78020120210111 is 11101202102087.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (11101202102087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78020120210111 - 2¹⁴ = 78020120193727 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78020120210119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39010060105055 + 39010060105056.

It is an arithmetic number, because the mean of its divisors is an integer number (39010060105056).

Almost surely, 2^{78020120210111} is an apocalyptic number.

78020120210111 is a deficient number, since it is larger than the sum of its proper divisors (1).

78020120210111 is an equidigital number, since it uses as much as digits as its factorization.

78020120210111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 78020120210111 its reverse (11101202102087), we get a palindrome (89121322312198).

The spelling of 78020120210111 in words is "seventy-eight trillion, twenty billion, one hundred twenty million, two hundred ten thousand, one hundred eleven".