21514243 has 4 divisors (see below), whose sum is σ = 21525048. Its totient is φ = 21503440.

The previous prime is 21514211. The next prime is 21514247. The reversal of 21514243 is 34241512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21514243 - 2⁵ = 21514211 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21514247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453 + ... + 6718.

It is an arithmetic number, because the mean of its divisors is an integer number (5381262).

Almost surely, 2^21514243 is an apocalyptic number.

21514243 is a deficient number, since it is larger than the sum of its proper divisors (10805).

21514243 is an equidigital number, since it uses as much as digits as its factorization.

21514243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10804.

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

The square root of 21514243 is about 4638.3448556570. The cubic root of 21514243 is about 278.1262775348.

Adding to 21514243 its reverse (34241512), we get a palindrome (55755755).

The spelling of 21514243 in words is "twenty-one million, five hundred fourteen thousand, two hundred forty-three".