78321022051 has 2 divisors, whose sum is σ = 78321022052. Its totient is φ = 78321022050.

The previous prime is 78321022001. The next prime is 78321022057. The reversal of 78321022051 is 15022012387.

It is a strong prime.

It is an emirp because it is prime and its reverse (15022012387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78321022051 - 2⁷ = 78321021923 is a prime.

It is a super-2 number, since 2×78321022051² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78321022057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39160511025 + 39160511026.

It is an arithmetic number, because the mean of its divisors is an integer number (39160511026).

Almost surely, 2^78321022051 is an apocalyptic number.

78321022051 is a deficient number, since it is larger than the sum of its proper divisors (1).

78321022051 is an equidigital number, since it uses as much as digits as its factorization.

78321022051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 78321022051 in words is "seventy-eight billion, three hundred twenty-one million, twenty-two thousand, fifty-one".