21260542253363 has 16 divisors (see below), whose sum is σ = 24391479974400. Its totient is φ = 18153041444736.

The previous prime is 21260542253359. The next prime is 21260542253389. The reversal of 21260542253363 is 36335224506212.

It is a cyclic number.

It is not a de Polignac number, because 21260542253363 - 2² = 21260542253359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21260542256363) 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, 34487531 + ... + 35098587.

It is an arithmetic number, because the mean of its divisors is an integer number (1524467498400).

Almost surely, 2^{21260542253363} is an apocalyptic number.

21260542253363 is a deficient number, since it is larger than the sum of its proper divisors (3130937721037).

21260542253363 is a wasteful number, since it uses less digits than its factorization.

21260542253363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630226.

The product of its (nonzero) digits is 1555200, while the sum is 44.

Adding to 21260542253363 its reverse (36335224506212), we get a palindrome (57595766759575).

The spelling of 21260542253363 in words is "twenty-one trillion, two hundred sixty billion, five hundred forty-two million, two hundred fifty-three thousand, three hundred sixty-three".