21240098177959 has 2 divisors, whose sum is σ = 21240098177960. Its totient is φ = 21240098177958.

The previous prime is 21240098177953. The next prime is 21240098178001. The reversal of 21240098177959 is 95977189004212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21240098177959 - 2³³ = 21231508243367 is a prime.

It is a super-2 number, since 2×21240098177959² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21240098177959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21240098177953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620049088979 + 10620049088980.

It is an arithmetic number, because the mean of its divisors is an integer number (10620049088980).

Almost surely, 2^{21240098177959} is an apocalyptic number.

21240098177959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240098177959 is an equidigital number, since it uses as much as digits as its factorization.

21240098177959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 21240098177959 in words is "twenty-one trillion, two hundred forty billion, ninety-eight million, one hundred seventy-seven thousand, nine hundred fifty-nine".