21260563413261 has 8 divisors (see below), whose sum is σ = 28350269490144. Its totient is φ = 14172283139280.

The previous prime is 21260563413259. The next prime is 21260563413289. The reversal of 21260563413261 is 16231436506212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21260563413261 - 2¹ = 21260563413259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260563413211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356415931 + ... + 356475576.

It is an arithmetic number, because the mean of its divisors is an integer number (3543783686268).

Almost surely, 2^{21260563413261} is an apocalyptic number.

It is an amenable number.

21260563413261 is a deficient number, since it is larger than the sum of its proper divisors (7089706076883).

21260563413261 is an equidigital number, since it uses as much as digits as its factorization.

21260563413261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712901451.

The product of its (nonzero) digits is 311040, while the sum is 42.

Adding to 21260563413261 its reverse (16231436506212), we get a palindrome (37491999919473).

The spelling of 21260563413261 in words is "twenty-one trillion, two hundred sixty billion, five hundred sixty-three million, four hundred thirteen thousand, two hundred sixty-one".