21543255051233 has 8 divisors (see below), whose sum is σ = 21656713844736. Its totient is φ = 21429803204800.

The previous prime is 21543255051223. The next prime is 21543255051239. The reversal of 21543255051233 is 33215055234512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21543255051233 - 2⁴ = 21543255051217 is a prime.

It is a super-2 number, since 2×21543255051233² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21543255051239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4541273 + ... + 7981833.

It is an arithmetic number, because the mean of its divisors is an integer number (2707089230592).

Almost surely, 2^{21543255051233} is an apocalyptic number.

It is an amenable number.

21543255051233 is a deficient number, since it is larger than the sum of its proper divisors (113458793503).

21543255051233 is a wasteful number, since it uses less digits than its factorization.

21543255051233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3473535.

The product of its (nonzero) digits is 540000, while the sum is 41.

The spelling of 21543255051233 in words is "twenty-one trillion, five hundred forty-three billion, two hundred fifty-five million, fifty-one thousand, two hundred thirty-three".