21370324 has 12 divisors (see below), whose sum is σ = 37818900. Its totient is φ = 10564928.

The previous prime is 21370249. The next prime is 21370333. The reversal of 21370324 is 42307312.

It can be written as a sum of positive squares in 2 ways, for example, as 15210000 + 6160324 = 3900^2 + 2482^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21370295 and 21370304.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 29659 + ... + 30370.

It is an arithmetic number, because the mean of its divisors is an integer number (3151575).

Almost surely, 2^21370324 is an apocalyptic number.

It is an amenable number.

21370324 is a deficient number, since it is larger than the sum of its proper divisors (16448576).

21370324 is a wasteful number, since it uses less digits than its factorization.

21370324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60122 (or 60120 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21370324 is about 4622.8047763236. The cubic root of 21370324 is about 277.5047165283.

Adding to 21370324 its reverse (42307312), we get a palindrome (63677636).

The spelling of 21370324 in words is "twenty-one million, three hundred seventy thousand, three hundred twenty-four".