78896830021 has 2 divisors, whose sum is σ = 78896830022. Its totient is φ = 78896830020.

The previous prime is 78896829967. The next prime is 78896830027. The reversal of 78896830021 is 12003869887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76698533025 + 2198296996 = 276945^2 + 46886^2 .

It is a cyclic number.

It is not a de Polignac number, because 78896830021 - 2³⁵ = 44537091653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78896830027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39448415010 + 39448415011.

It is an arithmetic number, because the mean of its divisors is an integer number (39448415011).

Almost surely, 2^78896830021 is an apocalyptic number.

It is an amenable number.

78896830021 is a deficient number, since it is larger than the sum of its proper divisors (1).

78896830021 is an equidigital number, since it uses as much as digits as its factorization.

78896830021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 78896830021 in words is "seventy-eight billion, eight hundred ninety-six million, eight hundred thirty thousand, twenty-one".