21601672641275 has 6 divisors (see below), whose sum is σ = 26786074075212. Its totient is φ = 17281338113000.

The previous prime is 21601672641257. The next prime is 21601672641319. The reversal of 21601672641275 is 57214627610612.

It is a happy number.

It is not a de Polignac number, because 21601672641275 - 2¹⁶ = 21601672575739 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432033452801 + ... + 432033452850.

It is an arithmetic number, because the mean of its divisors is an integer number (4464345679202).

Almost surely, 2^{21601672641275} is an apocalyptic number.

21601672641275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21601672641275 is a deficient number, since it is larger than the sum of its proper divisors (5184401433937).

21601672641275 is an equidigital number, since it uses as much as digits as its factorization.

21601672641275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864066905661 (or 864066905656 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 21601672641275 in words is "twenty-one trillion, six hundred one billion, six hundred seventy-two million, six hundred forty-one thousand, two hundred seventy-five".