21130544 has 20 divisors (see below), whose sum is σ = 41893896. Its totient is φ = 10319232.

The previous prime is 21130511. The next prime is 21130573. The reversal of 21130544 is 44503112.

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, 14669 + ... + 16044.

Almost surely, 2^21130544 is an apocalyptic number.

It is an amenable number.

21130544 is a deficient number, since it is larger than the sum of its proper divisors (20763352).

21130544 is a wasteful number, since it uses less digits than its factorization.

21130544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30764 (or 30758 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21130544 is about 4596.7971458397. The cubic root of 21130544 is about 276.4629212335.

Adding to 21130544 its reverse (44503112), we get a palindrome (65633656).

It can be divided in two parts, 2113054 and 4, that multiplied together give a triangular number (8452216 = T₄₁₁₁).

The spelling of 21130544 in words is "twenty-one million, one hundred thirty thousand, five hundred forty-four".