21233153542 has 4 divisors (see below), whose sum is σ = 31849730316. Its totient is φ = 10616576770.

The previous prime is 21233153531. The next prime is 21233153573. The reversal of 21233153542 is 24535133212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308288384 + ... + 5308288387.

It is an arithmetic number, because the mean of its divisors is an integer number (7962432579).

Almost surely, 2^21233153542 is an apocalyptic number.

21233153542 is a deficient number, since it is larger than the sum of its proper divisors (10616576774).

21233153542 is a wasteful number, since it uses less digits than its factorization.

21233153542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616576773.

The product of its digits is 21600, while the sum is 31.

Adding to 21233153542 its reverse (24535133212), we get a palindrome (45768286754).

The spelling of 21233153542 in words is "twenty-one billion, two hundred thirty-three million, one hundred fifty-three thousand, five hundred forty-two".