21030321032 has 64 divisors (see below), whose sum is σ = 47086341120. Its totient is φ = 8609755968.

The previous prime is 21030321031. The next prime is 21030321049. The reversal of 21030321032 is 23012303012.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21030321032.

It is not an unprimeable number, because it can be changed into a prime (21030321031) 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, 1003283 + ... + 1024029.

It is an arithmetic number, because the mean of its divisors is an integer number (735724080).

Almost surely, 2^21030321032 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 21030321032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23543170560).

21030321032 is an abundant number, since it is smaller than the sum of its proper divisors (26056020088).

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

21030321032 is a wasteful number, since it uses less digits than its factorization.

21030321032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21570 (or 21566 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21030321032 its reverse (23012303012), we get a palindrome (44042624044).

The spelling of 21030321032 in words is "twenty-one billion, thirty million, three hundred twenty-one thousand, thirty-two".