21140324 has 12 divisors (see below), whose sum is σ = 37041900. Its totient is φ = 10556928.

The previous prime is 21140303. The next prime is 21140341. The reversal of 21140324 is 42304112.

It can be written as a sum of positive squares in 2 ways, for example, as 9796900 + 11343424 = 3130^2 + 3368^2 .

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, 872 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (3086825).

Almost surely, 2^21140324 is an apocalyptic number.

It is an amenable number.

21140324 is a deficient number, since it is larger than the sum of its proper divisors (15901576).

21140324 is a wasteful number, since it uses less digits than its factorization.

21140324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622 (or 6620 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21140324 is about 4597.8608069405. The cubic root of 21140324 is about 276.5055670884.

Adding to 21140324 its reverse (42304112), we get a palindrome (63444436).

The spelling of 21140324 in words is "twenty-one million, one hundred forty thousand, three hundred twenty-four".