21659363782201 has 4 divisors (see below), whose sum is σ = 21920319972432. Its totient is φ = 21398407591972.

The previous prime is 21659363782183. The next prime is 21659363782219. The reversal of 21659363782201 is 10228736395612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21659363782183) and next prime (21659363782219).

It is a cyclic number.

It is not a de Polignac number, because 21659363782201 - 2¹⁹ = 21659363257913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21659363782241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130478094991 + ... + 130478095156.

It is an arithmetic number, because the mean of its divisors is an integer number (5480079993108).

Almost surely, 2^{21659363782201} is an apocalyptic number.

It is an amenable number.

21659363782201 is a deficient number, since it is larger than the sum of its proper divisors (260956190231).

21659363782201 is an equidigital number, since it uses as much as digits as its factorization.

21659363782201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260956190230.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 21659363782201 in words is "twenty-one trillion, six hundred fifty-nine billion, three hundred sixty-three million, seven hundred eighty-two thousand, two hundred one".