21243514 has 8 divisors (see below), whose sum is σ = 31891860. Its totient is φ = 10612896.

The previous prime is 21243503. The next prime is 21243517. The reversal of 21243514 is 41534212.

It can be written as a sum of positive squares in 2 ways, for example, as 15800625 + 5442889 = 3975^2 + 2333^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21243517) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 859 + ... + 6574.

Almost surely, 2^21243514 is an apocalyptic number.

21243514 is a deficient number, since it is larger than the sum of its proper divisors (10648346).

21243514 is a wasteful number, since it uses less digits than its factorization.

21243514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8864.

The product of its digits is 960, while the sum is 22.

The square root of 21243514 is about 4609.0686694819. The cubic root of 21243514 is about 276.9547294027.

Adding to 21243514 its reverse (41534212), we get a palindrome (62777726).

The spelling of 21243514 in words is "twenty-one million, two hundred forty-three thousand, five hundred fourteen".