21135130 has 8 divisors (see below), whose sum is σ = 38043252. Its totient is φ = 8454048.

The previous prime is 21135119. The next prime is 21135143. The reversal of 21135130 is 3153112.

It can be written as a sum of positive squares in 2 ways, for example, as 19421649 + 1713481 = 4407^2 + 1309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056747 + ... + 1056766.

Almost surely, 2^21135130 is an apocalyptic number.

21135130 is a deficient number, since it is larger than the sum of its proper divisors (16908122).

21135130 is a wasteful number, since it uses less digits than its factorization.

21135130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113520.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21135130 is about 4597.2959443569. The cubic root of 21135130 is about 276.4829202019.

Adding to 21135130 its reverse (3153112), we get a palindrome (24288242).

The spelling of 21135130 in words is "twenty-one million, one hundred thirty-five thousand, one hundred thirty".