21314253 has 4 divisors (see below), whose sum is σ = 28419008. Its totient is φ = 14209500.

The previous prime is 21314233. The next prime is 21314269. The reversal of 21314253 is 35241312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21314253 - 2⁵ = 21314221 is a prime.

It is a super-4 number, since 4×21314253⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314203) by changing a digit.

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, 3552373 + ... + 3552378.

It is an arithmetic number, because the mean of its divisors is an integer number (7104752).

Almost surely, 2^21314253 is an apocalyptic number.

It is an amenable number.

21314253 is a deficient number, since it is larger than the sum of its proper divisors (7104755).

21314253 is an equidigital number, since it uses as much as digits as its factorization.

21314253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104754.

The product of its digits is 720, while the sum is 21.

The square root of 21314253 is about 4616.7361847955. The cubic root of 21314253 is about 277.2618003007.

Adding to 21314253 its reverse (35241312), we get a palindrome (56555565).

The spelling of 21314253 in words is "twenty-one million, three hundred fourteen thousand, two hundred fifty-three".