21043514 has 4 divisors (see below), whose sum is σ = 31565274. Its totient is φ = 10521756.

The previous prime is 21043499. The next prime is 21043523. The reversal of 21043514 is 41534012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 8898289 = 3485^2 + 2983^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260877 + ... + 5260880.

Almost surely, 2^21043514 is an apocalyptic number.

21043514 is a deficient number, since it is larger than the sum of its proper divisors (10521760).

21043514 is a wasteful number, since it uses less digits than its factorization.

21043514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521759.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21043514 is about 4587.3210046824. The cubic root of 21043514 is about 276.0828446259.

Adding to 21043514 its reverse (41534012), we get a palindrome (62577526).

The spelling of 21043514 in words is "twenty-one million, forty-three thousand, five hundred fourteen".