21533423542 has 8 divisors (see below), whose sum is σ = 32352829056. Its totient is φ = 10749147192.

The previous prime is 21533423537. The next prime is 21533423551. The reversal of 21533423542 is 24532433512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21533423498 and 21533423507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8780758 + ... + 8783209.

It is an arithmetic number, because the mean of its divisors is an integer number (4044103632).

Almost surely, 2^21533423542 is an apocalyptic number.

21533423542 is a deficient number, since it is larger than the sum of its proper divisors (10819405514).

21533423542 is a wasteful number, since it uses less digits than its factorization.

21533423542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17564582.

The product of its digits is 86400, while the sum is 34.

The spelling of 21533423542 in words is "twenty-one billion, five hundred thirty-three million, four hundred twenty-three thousand, five hundred forty-two".