21507532274543 has 16 divisors (see below), whose sum is σ = 24593223393024. Its totient is φ = 18425138990400.

The previous prime is 21507532274519. The next prime is 21507532274573. The reversal of 21507532274543 is 34547223570512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21507532274543 - 2¹⁸ = 21507532012399 is a prime.

It is a super-2 number, since 2×21507532274543² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21507532274491 and 21507532274500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507532274573) 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, 266633768 + ... + 266714418.

It is an arithmetic number, because the mean of its divisors is an integer number (1537076462064).

Almost surely, 2^{21507532274543} is an apocalyptic number.

21507532274543 is a deficient number, since it is larger than the sum of its proper divisors (3085691118481).

21507532274543 is a wasteful number, since it uses less digits than its factorization.

21507532274543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100622.

The product of its (nonzero) digits is 7056000, while the sum is 50.

The spelling of 21507532274543 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, two hundred seventy-four thousand, five hundred forty-three".