21750452 has 6 divisors (see below), whose sum is σ = 38063298. Its totient is φ = 10875224.

The previous prime is 21750427. The next prime is 21750457. The reversal of 21750452 is 25405712.

21750452 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 14546596 + 7203856 = 3814^2 + 2684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21750457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2718803 + ... + 2718810.

It is an arithmetic number, because the mean of its divisors is an integer number (6343883).

Almost surely, 2^21750452 is an apocalyptic number.

It is an amenable number.

21750452 is a deficient number, since it is larger than the sum of its proper divisors (16312846).

21750452 is a wasteful number, since it uses less digits than its factorization.

21750452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5437617 (or 5437615 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21750452 is about 4663.7379857792. The cubic root of 21750452 is about 279.1404422187.

The spelling of 21750452 in words is "twenty-one million, seven hundred fifty thousand, four hundred fifty-two".