21514253 has 4 divisors (see below), whose sum is σ = 21584640. Its totient is φ = 21443868.

The previous prime is 21514249. The next prime is 21514301. The reversal of 21514253 is 35241512.

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 a cyclic number.

It is not a de Polignac number, because 21514253 - 2² = 21514249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34733 + ... + 35346.

It is an arithmetic number, because the mean of its divisors is an integer number (5396160).

Almost surely, 2^21514253 is an apocalyptic number.

It is an amenable number.

21514253 is a deficient number, since it is larger than the sum of its proper divisors (70387).

21514253 is an equidigital number, since it uses as much as digits as its factorization.

21514253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70386.

The product of its digits is 1200, while the sum is 23.

The square root of 21514253 is about 4638.3459336276. The cubic root of 21514253 is about 278.1263206266.

Adding to 21514253 its reverse (35241512), we get a palindrome (56755765).

The spelling of 21514253 in words is "twenty-one million, five hundred fourteen thousand, two hundred fifty-three".