21231389088 has 192 divisors, whose sum is σ = 76215525120. Its totient is φ = 5599466496.

The previous prime is 21231389083. The next prime is 21231389111. The reversal of 21231389088 is 88098313212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21231389083) 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 31 ways as a sum of consecutive naturals, for example, 56395 + ... + 213642.

It is an arithmetic number, because the mean of its divisors is an integer number (396955860).

Almost surely, 2^21231389088 is an apocalyptic number.

21231389088 is a gapful number since it is divisible by the number (28) 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 21231389088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38107762560).

21231389088 is an abundant number, since it is smaller than the sum of its proper divisors (54984136032).

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

21231389088 is a wasteful number, since it uses less digits than its factorization.

21231389088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270076 (or 270062 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

It can be divided in two parts, 212313 and 89088, that added together give a square (301401 = 549²).

The spelling of 21231389088 in words is "twenty-one billion, two hundred thirty-one million, three hundred eighty-nine thousand, eighty-eight".