21425533543 has 4 divisors (see below), whose sum is σ = 21527076568. Its totient is φ = 21323990520.

The previous prime is 21425533537. The next prime is 21425533553. The reversal of 21425533543 is 34533552412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21425533543 - 2²⁵ = 21391979111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425533553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50771196 + ... + 50771617.

It is an arithmetic number, because the mean of its divisors is an integer number (5381769142).

Almost surely, 2^21425533543 is an apocalyptic number.

21425533543 is a deficient number, since it is larger than the sum of its proper divisors (101543025).

21425533543 is a wasteful number, since it uses less digits than its factorization.

21425533543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101543024.

The product of its digits is 216000, while the sum is 37.

The spelling of 21425533543 in words is "twenty-one billion, four hundred twenty-five million, five hundred thirty-three thousand, five hundred forty-three".