78629302021 has 2 divisors, whose sum is σ = 78629302022. Its totient is φ = 78629302020.

The previous prime is 78629302001. The next prime is 78629302033. The reversal of 78629302021 is 12020392687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65902077796 + 12727224225 = 256714^2 + 112815^2 .

It is a cyclic number.

It is not a de Polignac number, because 78629302021 - 2²¹ = 78627204869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78629302001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39314651010 + 39314651011.

It is an arithmetic number, because the mean of its divisors is an integer number (39314651011).

Almost surely, 2^78629302021 is an apocalyptic number.

It is an amenable number.

78629302021 is a deficient number, since it is larger than the sum of its proper divisors (1).

78629302021 is an equidigital number, since it uses as much as digits as its factorization.

78629302021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 78629302021 in words is "seventy-eight billion, six hundred twenty-nine million, three hundred two thousand, twenty-one".