21130446 has 16 divisors (see below), whose sum is σ = 42796800. Its totient is φ = 6954168.

The previous prime is 21130423. The next prime is 21130453. The reversal of 21130446 is 64403112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21816 + ... + 22763.

It is an arithmetic number, because the mean of its divisors is an integer number (2674800).

Almost surely, 2^21130446 is an apocalyptic number.

21130446 is an abundant number, since it is smaller than the sum of its proper divisors (21666354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21130446 is a wasteful number, since it uses less digits than its factorization.

21130446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44663.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21130446 is about 4596.7864862314. The cubic root of 21130446 is about 276.4624938363.

Adding to 21130446 its reverse (64403112), we get a palindrome (85533558).

The spelling of 21130446 in words is "twenty-one million, one hundred thirty thousand, four hundred forty-six".