21260554431460 has 48 divisors (see below), whose sum is σ = 45234492016896. Its totient is φ = 8392913419392.

The previous prime is 21260554431397. The next prime is 21260554431463. The reversal of 21260554431460 is 6413445506212.

It is a super-2 number, since 2×21260554431460² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21260554431463) 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, 17008464 + ... + 18215623.

It is an arithmetic number, because the mean of its divisors is an integer number (942385250352).

Almost surely, 2^{21260554431460} is an apocalyptic number.

21260554431460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21260554431460 is an abundant number, since it is smaller than the sum of its proper divisors (23973937585436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21260554431460 is a wasteful number, since it uses less digits than its factorization.

21260554431460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35224492 (or 35224490 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 43.

Adding to 21260554431460 its reverse (6413445506212), we get a palindrome (27673999937672).

The spelling of 21260554431460 in words is "twenty-one trillion, two hundred sixty billion, five hundred fifty-four million, four hundred thirty-one thousand, four hundred sixty".