21454313 has 4 divisors (see below), whose sum is σ = 21544320. Its totient is φ = 21364308.

The previous prime is 21454297. The next prime is 21454333. The reversal of 21454313 is 31345412.

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 21454313 - 2⁴ = 21454297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454333) 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, 44645 + ... + 45122.

It is an arithmetic number, because the mean of its divisors is an integer number (5386080).

Almost surely, 2^21454313 is an apocalyptic number.

It is an amenable number.

21454313 is a deficient number, since it is larger than the sum of its proper divisors (90007).

21454313 is an equidigital number, since it uses as much as digits as its factorization.

21454313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90006.

The product of its digits is 1440, while the sum is 23.

The square root of 21454313 is about 4631.8800718499. The cubic root of 21454313 is about 277.8677881753.

Adding to 21454313 its reverse (31345412), we get a palindrome (52799725).

The spelling of 21454313 in words is "twenty-one million, four hundred fifty-four thousand, three hundred thirteen".