21450352 has 80 divisors (see below), whose sum is σ = 54139392. Its totient is φ = 7983360.

The previous prime is 21450349. The next prime is 21450353. The reversal of 21450352 is 25305412.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450353) 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, 27958 + ... + 28714.

Almost surely, 2^21450352 is an apocalyptic number.

21450352 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 21450352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27069696).

21450352 is an abundant number, since it is smaller than the sum of its proper divisors (32689040).

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

21450352 is a wasteful number, since it uses less digits than its factorization.

21450352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21450352 is about 4631.4524719574. The cubic root of 21450352 is about 277.8506866870.

Adding to 21450352 its reverse (25305412), we get a palindrome (46755764).

The spelling of 21450352 in words is "twenty-one million, four hundred fifty thousand, three hundred fifty-two".