21232111000 has 128 divisors (see below), whose sum is σ = 50560473600. Its totient is φ = 8344252800.

The previous prime is 21232110997. The next prime is 21232111001. The reversal of 21232111000 is 11123212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232111001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14316259 + ... + 14317741.

It is an arithmetic number, because the mean of its divisors is an integer number (395003700).

Almost surely, 2^21232111000 is an apocalyptic number.

21232111000 is a gapful number since it is divisible by the number (20) 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 21232111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25280236800).

21232111000 is an abundant number, since it is smaller than the sum of its proper divisors (29328362600).

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

21232111000 is a wasteful number, since it uses less digits than its factorization.

21232111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1732 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21232111000 its reverse (11123212), we get a palindrome (21243234212).

The spelling of 21232111000 in words is "twenty-one billion, two hundred thirty-two million, one hundred eleven thousand".