21045230 has 32 divisors (see below), whose sum is σ = 40613184. Its totient is φ = 7831296.

The previous prime is 21045229. The next prime is 21045239. The reversal of 21045230 is 3254012.

It is a junction number, because it is equal to n+sod(n) for n = 21045199 and 21045208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7274 + ... + 9746.

It is an arithmetic number, because the mean of its divisors is an integer number (1269162).

Almost surely, 2^21045230 is an apocalyptic number.

21045230 is a deficient number, since it is larger than the sum of its proper divisors (19567954).

21045230 is a wasteful number, since it uses less digits than its factorization.

21045230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21045230 is about 4587.5080381401. The cubic root of 21045230 is about 276.0903488429.

Adding to 21045230 its reverse (3254012), we get a palindrome (24299242).

The spelling of 21045230 in words is "twenty-one million, forty-five thousand, two hundred thirty".