21673031232 has 112 divisors (see below), whose sum is σ = 57914722880. Its totient is φ = 7152648192.

The previous prime is 21673031117. The next prime is 21673031249. The reversal of 21673031232 is 23213037612.

It is a self number, because there is not a number n which added to its sum of digits gives 21673031232.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12195528 + ... + 12197304.

It is an arithmetic number, because the mean of its divisors is an integer number (517095740).

Almost surely, 2^21673031232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21673031232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28957361440).

21673031232 is an abundant number, since it is smaller than the sum of its proper divisors (36241691648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21673031232 is a wasteful number, since it uses less digits than its factorization.

21673031232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2388 (or 2378 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 30.

Adding to 21673031232 its reverse (23213037612), we get a palindrome (44886068844).

The spelling of 21673031232 in words is "twenty-one billion, six hundred seventy-three million, thirty-one thousand, two hundred thirty-two".