21232000 has 64 divisors (see below), whose sum is σ = 52827840. Its totient is φ = 8486400.

The previous prime is 21231979. The next prime is 21232007. The reversal of 21232000 is 23212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15337 + ... + 16663.

It is an arithmetic number, because the mean of its divisors is an integer number (825435).

Almost surely, 2^21232000 is an apocalyptic number.

21232000 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 21232000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26413920).

21232000 is an abundant number, since it is smaller than the sum of its proper divisors (31595840).

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

21232000 is an equidigital number, since it uses as much as digits as its factorization.

21232000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21232000 is about 4607.8194409069. The cubic root of 21232000 is about 276.9046838053.

Adding to 21232000 its reverse (23212), we get a palindrome (21255212).

The spelling of 21232000 in words is "twenty-one million, two hundred thirty-two thousand".