21354040053533 has 16 divisors (see below), whose sum is σ = 24665892448320. Its totient is φ = 18270641376000.

The previous prime is 21354040053503. The next prime is 21354040053539. The reversal of 21354040053533 is 33535004045312.

It is a cyclic number.

It is not a de Polignac number, because 21354040053533 - 2²⁴ = 21354023276317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354040053539) 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, 18564083 + ... + 19680783.

It is an arithmetic number, because the mean of its divisors is an integer number (1541618278020).

Almost surely, 2^{21354040053533} is an apocalyptic number.

It is an amenable number.

21354040053533 is a deficient number, since it is larger than the sum of its proper divisors (3311852394787).

21354040053533 is a wasteful number, since it uses less digits than its factorization.

21354040053533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218988.

The product of its (nonzero) digits is 324000, while the sum is 38.

Adding to 21354040053533 its reverse (33535004045312), we get a palindrome (54889044098845).

The spelling of 21354040053533 in words is "twenty-one trillion, three hundred fifty-four billion, forty million, fifty-three thousand, five hundred thirty-three".