67876801021 has 2 divisors, whose sum is σ = 67876801022. Its totient is φ = 67876801020.

The previous prime is 67876801019. The next prime is 67876801043. The reversal of 67876801021 is 12010867876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66933451225 + 943349796 = 258715^2 + 30714^2 .

It is a cyclic number.

It is not a de Polignac number, because 67876801021 - 2¹ = 67876801019 is a prime.

Together with 67876801019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67876801081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33938400510 + 33938400511.

It is an arithmetic number, because the mean of its divisors is an integer number (33938400511).

Almost surely, 2^67876801021 is an apocalyptic number.

It is an amenable number.

67876801021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67876801021 is an equidigital number, since it uses as much as digits as its factorization.

67876801021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 67876801021 in words is "sixty-seven billion, eight hundred seventy-six million, eight hundred one thousand, twenty-one".