21233504542 has 8 divisors (see below), whose sum is σ = 31852176336. Its totient is φ = 10616112432.

The previous prime is 21233504503. The next prime is 21233504557. The reversal of 21233504542 is 24540533212.

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

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, 277303 + ... + 345490.

It is an arithmetic number, because the mean of its divisors is an integer number (3981522042).

Almost surely, 2^21233504542 is an apocalyptic number.

21233504542 is a deficient number, since it is larger than the sum of its proper divisors (10618671794).

21233504542 is a wasteful number, since it uses less digits than its factorization.

21233504542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639842.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 21233504542 in words is "twenty-one billion, two hundred thirty-three million, five hundred four thousand, five hundred forty-two".