21171767743199 has 2 divisors, whose sum is σ = 21171767743200. Its totient is φ = 21171767743198.

The previous prime is 21171767743193. The next prime is 21171767743237. The reversal of 21171767743199 is 99134776717112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21171767743199 - 2⁴ = 21171767743183 is a prime.

It is a super-2 number, since 2×21171767743199² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21171767743193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10585883871599 + 10585883871600.

It is an arithmetic number, because the mean of its divisors is an integer number (10585883871600).

Almost surely, 2^{21171767743199} is an apocalyptic number.

21171767743199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21171767743199 is an equidigital number, since it uses as much as digits as its factorization.

21171767743199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28005264, while the sum is 65.

The spelling of 21171767743199 in words is "twenty-one trillion, one hundred seventy-one billion, seven hundred sixty-seven million, seven hundred forty-three thousand, one hundred ninety-nine".