21240230 has 16 divisors (see below), whose sum is σ = 41708304. Its totient is φ = 7723680.

The previous prime is 21240223. The next prime is 21240251. The reversal of 21240230 is 3204212.

It is a super-2 number, since 2×21240230² = 902294740905800, which contains 22 as substring.

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, 96437 + ... + 96656.

It is an arithmetic number, because the mean of its divisors is an integer number (2606769).

Almost surely, 2^21240230 is an apocalyptic number.

21240230 is a deficient number, since it is larger than the sum of its proper divisors (20468074).

21240230 is a wasteful number, since it uses less digits than its factorization.

21240230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193111.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21240230 is about 4608.7124015282. The cubic root of 21240230 is about 276.9404573414.

Adding to 21240230 its reverse (3204212), we get a palindrome (24444442).

The spelling of 21240230 in words is "twenty-one million, two hundred forty thousand, two hundred thirty".