21641400260305 has 16 divisors (see below), whose sum is σ = 29732919471360. Its totient is φ = 14813174907072.

The previous prime is 21641400260261. The next prime is 21641400260309. The reversal of 21641400260305 is 50306200414612.

It is a cyclic number.

It is not a de Polignac number, because 21641400260305 - 2⁹ = 21641400259793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21641400260309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555030525 + ... + 555069514.

It is an arithmetic number, because the mean of its divisors is an integer number (1858307466960).

Almost surely, 2^{21641400260305} is an apocalyptic number.

It is an amenable number.

21641400260305 is a deficient number, since it is larger than the sum of its proper divisors (8091519211055).

21641400260305 is a wasteful number, since it uses less digits than its factorization.

21641400260305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110100608.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21641400260305 its reverse (50306200414612), we get a palindrome (71947600674917).

The spelling of 21641400260305 in words is "twenty-one trillion, six hundred forty-one billion, four hundred million, two hundred sixty thousand, three hundred five".