21244130 has 16 divisors (see below), whose sum is σ = 38888640. Its totient is φ = 8353392.

The previous prime is 21244121. The next prime is 21244163. The reversal of 21244130 is 3144212.

It is a junction number, because it is equal to n+sod(n) for n = 21244099 and 21244108.

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, 17414 + ... + 18593.

It is an arithmetic number, because the mean of its divisors is an integer number (2430540).

Almost surely, 2^21244130 is an apocalyptic number.

21244130 is a deficient number, since it is larger than the sum of its proper divisors (17644510).

21244130 is a wasteful number, since it uses less digits than its factorization.

21244130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36073.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21244130 is about 4609.1354937775. The cubic root of 21244130 is about 276.9574063368.

Adding to 21244130 its reverse (3144212), we get a palindrome (24388342).

The spelling of 21244130 in words is "twenty-one million, two hundred forty-four thousand, one hundred thirty".