21450452 has 12 divisors (see below), whose sum is σ = 38099040. Its totient is φ = 10565016.

The previous prime is 21450433. The next prime is 21450461. The reversal of 21450452 is 25405412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 39752 + ... + 40287.

It is an arithmetic number, because the mean of its divisors is an integer number (3174920).

Almost surely, 2^21450452 is an apocalyptic number.

It is an amenable number.

21450452 is a deficient number, since it is larger than the sum of its proper divisors (16648588).

21450452 is a wasteful number, since it uses less digits than its factorization.

21450452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80110 (or 80108 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 21450452 is about 4631.4632676941. The cubic root of 21450452 is about 277.8511184596.

Adding to 21450452 its reverse (25405412), we get a palindrome (46855864).

The spelling of 21450452 in words is "twenty-one million, four hundred fifty thousand, four hundred fifty-two".