21576130 has 16 divisors (see below), whose sum is σ = 39123000. Its totient is φ = 8566912.

The previous prime is 21576101. The next prime is 21576133. The reversal of 21576130 is 3167512.

It can be written as a sum of positive squares in 4 ways, for example, as 11785489 + 9790641 = 3433^2 + 3129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21576095 and 21576104.

It is not an unprimeable number, because it can be changed into a prime (21576133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6505 + ... + 9244.

Almost surely, 2^21576130 is an apocalyptic number.

21576130 is a deficient number, since it is larger than the sum of its proper divisors (17546870).

21576130 is a wasteful number, since it uses less digits than its factorization.

21576130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15893.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21576130 is about 4645.0113024620. The cubic root of 21576130 is about 278.3927044952.

The spelling of 21576130 in words is "twenty-one million, five hundred seventy-six thousand, one hundred thirty".