21450052 has 24 divisors (see below), whose sum is σ = 41415192. Its totient is φ = 9657600.

The previous prime is 21450029. The next prime is 21450061. The reversal of 21450052 is 25005412.

It can be written as a sum of positive squares in 4 ways, for example, as 50176 + 21399876 = 224^2 + 4626^2 .

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2899 + ... + 7162.

It is an arithmetic number, because the mean of its divisors is an integer number (1725633).

Almost surely, 2^21450052 is an apocalyptic number.

It is an amenable number.

21450052 is a deficient number, since it is larger than the sum of its proper divisors (19965140).

21450052 is a wasteful number, since it uses less digits than its factorization.

21450052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10119 (or 10117 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21450052 is about 4631.4200845961. The cubic root of 21450052 is about 277.8493913610.

Adding to 21450052 its reverse (25005412), we get a palindrome (46455464).

The spelling of 21450052 in words is "twenty-one million, four hundred fifty thousand, fifty-two".