21223123032 has 64 divisors (see below), whose sum is σ = 54803865600. Its totient is φ = 6841854720.

The previous prime is 21223123021. The next prime is 21223123037. The reversal of 21223123032 is 23032132212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223123037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1300588 + ... + 1316804.

It is an arithmetic number, because the mean of its divisors is an integer number (856310400).

Almost surely, 2^21223123032 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 21223123032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27401932800).

21223123032 is an abundant number, since it is smaller than the sum of its proper divisors (33580742568).

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

21223123032 is a wasteful number, since it uses less digits than its factorization.

21223123032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18016 (or 18012 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21223123032 its reverse (23032132212), we get a palindrome (44255255244).

The spelling of 21223123032 in words is "twenty-one billion, two hundred twenty-three million, one hundred twenty-three thousand, thirty-two".