21344254 has 8 divisors (see below), whose sum is σ = 32761080. Its totient is φ = 10423896.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344254 is 45244312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124009 + ... + 124180.

It is an arithmetic number, because the mean of its divisors is an integer number (4095135).

Almost surely, 2^21344254 is an apocalyptic number.

21344254 is a deficient number, since it is larger than the sum of its proper divisors (11416826).

21344254 is a wasteful number, since it uses less digits than its factorization.

21344254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248234.

The product of its digits is 3840, while the sum is 25.

The square root of 21344254 is about 4619.9841991072. The cubic root of 21344254 is about 277.3918264632.

Adding to 21344254 its reverse (45244312), we get a palindrome (66588566).

The spelling of 21344254 in words is "twenty-one million, three hundred forty-four thousand, two hundred fifty-four".