21454344 has 48 divisors (see below), whose sum is σ = 61167600. Its totient is φ = 6774624.

The previous prime is 21454333. The next prime is 21454373. The reversal of 21454344 is 44345412.

It is a happy number.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6474 + ... + 9209.

It is an arithmetic number, because the mean of its divisors is an integer number (1274325).

Almost surely, 2^21454344 is an apocalyptic number.

21454344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21454344 is an abundant number, since it is smaller than the sum of its proper divisors (39713256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454344 is a wasteful number, since it uses less digits than its factorization.

21454344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15714 (or 15707 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 21454344 is about 4631.8834182220. The cubic root of 21454344 is about 277.8679220085.

Adding to 21454344 its reverse (44345412), we get a palindrome (65799756).

The spelling of 21454344 in words is "twenty-one million, four hundred fifty-four thousand, three hundred forty-four".