21454324 has 12 divisors (see below), whose sum is σ = 37610244. Its totient is φ = 10708544.

The previous prime is 21454297. The next prime is 21454333. The reversal of 21454324 is 42345412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 20611600 = 918^2 + 4540^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1879 + ... + 6814.

It is an arithmetic number, because the mean of its divisors is an integer number (3134187).

Almost surely, 2^21454324 is an apocalyptic number.

It is an amenable number.

21454324 is a deficient number, since it is larger than the sum of its proper divisors (16155920).

21454324 is a wasteful number, since it uses less digits than its factorization.

21454324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314 (or 9312 counting only the distinct ones).

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

The square root of 21454324 is about 4631.8812592725. The cubic root of 21454324 is about 277.8678356645.

Adding to 21454324 its reverse (42345412), we get a palindrome (63799736).

The spelling of 21454324 in words is "twenty-one million, four hundred fifty-four thousand, three hundred twenty-four".