21563532892 has 12 divisors (see below), whose sum is σ = 41166744696. Its totient is φ = 9801605840.

The previous prime is 21563532863. The next prime is 21563532917. The reversal of 21563532892 is 29823536512.

It is a happy number.

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, 245040103 + ... + 245040190.

It is an arithmetic number, because the mean of its divisors is an integer number (3430562058).

Almost surely, 2^21563532892 is an apocalyptic number.

21563532892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21563532892 is a deficient number, since it is larger than the sum of its proper divisors (19603211804).

21563532892 is a wasteful number, since it uses less digits than its factorization.

21563532892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490080308 (or 490080306 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

It can be divided in two parts, 21563 and 532892, that added together give a palindrome (554455).

The spelling of 21563532892 in words is "twenty-one billion, five hundred sixty-three million, five hundred thirty-two thousand, eight hundred ninety-two".