21080250777587 has 2 divisors, whose sum is σ = 21080250777588. Its totient is φ = 21080250777586.

The previous prime is 21080250777571. The next prime is 21080250777637. The reversal of 21080250777587 is 78577705208012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21080250777587 - 2⁴ = 21080250777571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21080250777517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10540125388793 + 10540125388794.

It is an arithmetic number, because the mean of its divisors is an integer number (10540125388794).

Almost surely, 2^{21080250777587} is an apocalyptic number.

21080250777587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21080250777587 is an equidigital number, since it uses as much as digits as its factorization.

21080250777587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15366400, while the sum is 59.

The spelling of 21080250777587 in words is "twenty-one trillion, eighty billion, two hundred fifty million, seven hundred seventy-seven thousand, five hundred eighty-seven".