21000255904339 has 2 divisors, whose sum is σ = 21000255904340. Its totient is φ = 21000255904338.

The previous prime is 21000255904319. The next prime is 21000255904349. The reversal of 21000255904339 is 93340955200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000255904339 - 2⁵ = 21000255904307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000255904295 and 21000255904304.

It is not a weakly prime, because it can be changed into another prime (21000255904319) 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, 10500127952169 + 10500127952170.

It is an arithmetic number, because the mean of its divisors is an integer number (10500127952170).

Almost surely, 2^{21000255904339} is an apocalyptic number.

21000255904339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000255904339 is an equidigital number, since it uses as much as digits as its factorization.

21000255904339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 21000255904339 in words is "twenty-one trillion, two hundred fifty-five million, nine hundred four thousand, three hundred thirty-nine".