21124130 has 8 divisors (see below), whose sum is σ = 38023452. Its totient is φ = 8449648.

The previous prime is 21124123. The next prime is 21124141. The reversal of 21124130 is 3142112.

It can be written as a sum of positive squares in 2 ways, for example, as 17952169 + 3171961 = 4237^2 + 1781^2 .

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

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, 1056197 + ... + 1056216.

Almost surely, 2^21124130 is an apocalyptic number.

21124130 is a deficient number, since it is larger than the sum of its proper divisors (16899322).

21124130 is a wasteful number, since it uses less digits than its factorization.

21124130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112420.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21124130 is about 4596.0994332151. The cubic root of 21124130 is about 276.4349457332.

Adding to 21124130 its reverse (3142112), we get a palindrome (24266242).

It can be divided in two parts, 2 and 1124130, that multiplied together give a triangular number (2248260 = T₂₁₂₀).

The spelling of 21124130 in words is "twenty-one million, one hundred twenty-four thousand, one hundred thirty".