21120230 has 16 divisors (see below), whose sum is σ = 38661840. Its totient is φ = 8304672.

The previous prime is 21120223. The next prime is 21120251. The reversal of 21120230 is 3202112.

It is a happy number.

It is a congruent number.

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, 17309 + ... + 18488.

It is an arithmetic number, because the mean of its divisors is an integer number (2416365).

Almost surely, 2^21120230 is an apocalyptic number.

21120230 is a deficient number, since it is larger than the sum of its proper divisors (17541610).

21120230 is a wasteful number, since it uses less digits than its factorization.

21120230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35863.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21120230 is about 4595.6751408253. The cubic root of 21120230 is about 276.4179326042.

Adding to 21120230 its reverse (3202112), we get a palindrome (24322342).

The spelling of 21120230 in words is "twenty-one million, one hundred twenty thousand, two hundred thirty".