21230352 has 120 divisors (see below), whose sum is σ = 69870528. Its totient is φ = 5932800.

The previous prime is 21230329. The next prime is 21230359. The reversal of 21230352 is 25303212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230359) 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 23 ways as a sum of consecutive naturals, for example, 20077 + ... + 21107.

Almost surely, 2^21230352 is an apocalyptic number.

21230352 is a gapful number since it is divisible by the number (22) 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 21230352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34935264).

21230352 is an abundant number, since it is smaller than the sum of its proper divisors (48640176).

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

21230352 is a wasteful number, since it uses less digits than its factorization.

21230352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21230352 is about 4607.6406109852. The cubic root of 21230352 is about 276.8975192937.

Adding to 21230352 its reverse (25303212), we get a palindrome (46533564).

The spelling of 21230352 in words is "twenty-one million, two hundred thirty thousand, three hundred fifty-two".