21126230 has 16 divisors (see below), whose sum is σ = 38155104. Its totient is φ = 8422080.

The previous prime is 21126229. The next prime is 21126253. The reversal of 21126230 is 3262112.

It is a junction number, because it is equal to n+sod(n) for n = 21126199 and 21126208.

It is a congruent number.

It is an unprimeable number.

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, 287 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (2384694).

Almost surely, 2^21126230 is an apocalyptic number.

21126230 is a deficient number, since it is larger than the sum of its proper divisors (17028874).

21126230 is a wasteful number, since it uses less digits than its factorization.

21126230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21126230 is about 4596.3278821250. The cubic root of 21126230 is about 276.4441057814. Note that the first 3 decimals are identical.

Adding to 21126230 its reverse (3262112), we get a palindrome (24388342).

The spelling of 21126230 in words is "twenty-one million, one hundred twenty-six thousand, two hundred thirty".