21238130 has 16 divisors (see below), whose sum is σ = 39118464. Its totient is φ = 8297520.

The previous prime is 21238127. The next prime is 21238141. The reversal of 21238130 is 3183212.

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, 24266 + ... + 25125.

It is an arithmetic number, because the mean of its divisors is an integer number (2444904).

Almost surely, 2^21238130 is an apocalyptic number.

21238130 is a deficient number, since it is larger than the sum of its proper divisors (17880334).

21238130 is a wasteful number, since it uses less digits than its factorization.

21238130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49441.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21238130 is about 4608.4845665359. The cubic root of 21238130 is about 276.9313300999.

The spelling of 21238130 in words is "twenty-one million, two hundred thirty-eight thousand, one hundred thirty".