21373463302553 has 16 divisors (see below), whose sum is σ = 24271284942720. Its totient is φ = 18697878740736.

The previous prime is 21373463302511. The next prime is 21373463302561. The reversal of 21373463302553 is 35520336437312.

It is a cyclic number.

It is not a de Polignac number, because 21373463302553 - 2¹⁰ = 21373463301529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21373463302498 and 21373463302507.

It is not an unprimeable number, because it can be changed into a prime (21373463382553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624244325 + ... + 624278562.

It is an arithmetic number, because the mean of its divisors is an integer number (1516955308920).

Almost surely, 2^{21373463302553} is an apocalyptic number.

It is an amenable number.

21373463302553 is a deficient number, since it is larger than the sum of its proper divisors (2897821640167).

21373463302553 is a wasteful number, since it uses less digits than its factorization.

21373463302553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248522976.

The product of its (nonzero) digits is 4082400, while the sum is 47.

Adding to 21373463302553 its reverse (35520336437312), we get a palindrome (56893799739865).

The spelling of 21373463302553 in words is "twenty-one trillion, three hundred seventy-three billion, four hundred sixty-three million, three hundred two thousand, five hundred fifty-three".