21354324 has 24 divisors (see below), whose sum is σ = 51545760. Its totient is φ = 6872544.

The previous prime is 21354301. The next prime is 21354337. The reversal of 21354324 is 42345312.

It is a junction number, because it is equal to n+sod(n) for n = 21354294 and 21354303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30334 + ... + 31029.

It is an arithmetic number, because the mean of its divisors is an integer number (2147740).

Almost surely, 2^21354324 is an apocalyptic number.

It is an amenable number.

21354324 is an abundant number, since it is smaller than the sum of its proper divisors (30191436).

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

21354324 is a wasteful number, since it uses less digits than its factorization.

21354324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61399 (or 61397 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21354324 is about 4621.0739011619. The cubic root of 21354324 is about 277.4354431437.

Adding to 21354324 its reverse (42345312), we get a palindrome (63699636).

The spelling of 21354324 in words is "twenty-one million, three hundred fifty-four thousand, three hundred twenty-four".