21145324 has 6 divisors (see below), whose sum is σ = 37004324. Its totient is φ = 10572660.

The previous prime is 21145307. The next prime is 21145343. The reversal of 21145324 is 42354112.

It is a junction number, because it is equal to n+sod(n) for n = 21145295 and 21145304.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643162 + ... + 2643169.

Almost surely, 2^21145324 is an apocalyptic number.

It is an amenable number.

21145324 is a deficient number, since it is larger than the sum of its proper divisors (15859000).

21145324 is a wasteful number, since it uses less digits than its factorization.

21145324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286335 (or 5286333 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21145324 is about 4598.4045059129. The cubic root of 21145324 is about 276.5273645918.

Adding to 21145324 its reverse (42354112), we get a palindrome (63499436).

The spelling of 21145324 in words is "twenty-one million, one hundred forty-five thousand, three hundred twenty-four".