21223124032 has 112 divisors (see below), whose sum is σ = 49487328000. Its totient is φ = 8926364160.

The previous prime is 21223124009. The next prime is 21223124033. The reversal of 21223124032 is 23042132212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21223123994 and 21223124012.

It is not an unprimeable number, because it can be changed into a prime (21223124033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556719 + ... + 593617.

Almost surely, 2^21223124032 is an apocalyptic number.

21223124032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223124032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24743664000).

21223124032 is an abundant number, since it is smaller than the sum of its proper divisors (28264203968).

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

21223124032 is a wasteful number, since it uses less digits than its factorization.

21223124032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36984 (or 36974 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21223124032 its reverse (23042132212), we get a palindrome (44265256244).

The spelling of 21223124032 in words is "twenty-one billion, two hundred twenty-three million, one hundred twenty-four thousand, thirty-two".