21234552 has 32 divisors (see below), whose sum is σ = 55881600. Its totient is φ = 6705504.

The previous prime is 21234541. The next prime is 21234593. The reversal of 21234552 is 25543212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22828 + ... + 23739.

It is an arithmetic number, because the mean of its divisors is an integer number (1746300).

Almost surely, 2^21234552 is an apocalyptic number.

It is an amenable number.

21234552 is an abundant number, since it is smaller than the sum of its proper divisors (34647048).

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

21234552 is a wasteful number, since it uses less digits than its factorization.

21234552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46595 (or 46591 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 21234552 is about 4608.0963531593. The cubic root of 21234552 is about 276.9157776329.

Adding to 21234552 its reverse (25543212), we get a palindrome (46777764).

The spelling of 21234552 in words is "twenty-one million, two hundred thirty-four thousand, five hundred fifty-two".