21203324 has 6 divisors (see below), whose sum is σ = 37105824. Its totient is φ = 10601660.

The previous prime is 21203317. The next prime is 21203341. The reversal of 21203324 is 42330212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650412 + ... + 2650419.

It is an arithmetic number, because the mean of its divisors is an integer number (6184304).

Almost surely, 2^21203324 is an apocalyptic number.

It is an amenable number.

21203324 is a deficient number, since it is larger than the sum of its proper divisors (15902500).

21203324 is a wasteful number, since it uses less digits than its factorization.

21203324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300835 (or 5300833 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21203324 is about 4604.7067224743. The cubic root of 21203324 is about 276.7799648869.

Adding to 21203324 its reverse (42330212), we get a palindrome (63533536).

The spelling of 21203324 in words is "twenty-one million, two hundred three thousand, three hundred twenty-four".