21533254112 has 24 divisors (see below), whose sum is σ = 42494317992. Its totient is φ = 10741046400.

The previous prime is 21533254103. The next prime is 21533254147. The reversal of 21533254112 is 21145233512.

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, 785714 + ... + 812657.

It is an arithmetic number, because the mean of its divisors is an integer number (1770596583).

Almost surely, 2^21533254112 is an apocalyptic number.

It is an amenable number.

21533254112 is a deficient number, since it is larger than the sum of its proper divisors (20961063880).

21533254112 is a wasteful number, since it uses less digits than its factorization.

21533254112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598802 (or 1598794 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

Adding to 21533254112 its reverse (21145233512), we get a palindrome (42678487624).

The spelling of 21533254112 in words is "twenty-one billion, five hundred thirty-three million, two hundred fifty-four thousand, one hundred twelve".