78213700592221 has 2 divisors, whose sum is σ = 78213700592222. Its totient is φ = 78213700592220.

The previous prime is 78213700592197. The next prime is 78213700592257. The reversal of 78213700592221 is 12229500731287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68728908284100 + 9484792308121 = 8290290^2 + 3079739^2 .

It is a cyclic number.

It is not a de Polignac number, because 78213700592221 - 2²⁹ = 78213163721309 is a prime.

It is a super-2 number, since 2×78213700592221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78213700592021) 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, 39106850296110 + 39106850296111.

It is an arithmetic number, because the mean of its divisors is an integer number (39106850296111).

Almost surely, 2^{78213700592221} is an apocalyptic number.

It is an amenable number.

78213700592221 is a deficient number, since it is larger than the sum of its proper divisors (1).

78213700592221 is an equidigital number, since it uses as much as digits as its factorization.

78213700592221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 78213700592221 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred million, five hundred ninety-two thousand, two hundred twenty-one".