21103230 has 16 divisors (see below), whose sum is σ = 50647824. Its totient is φ = 5627520.

The previous prime is 21103217. The next prime is 21103241. The reversal of 21103230 is 3230112.

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, 351691 + ... + 351750.

It is an arithmetic number, because the mean of its divisors is an integer number (3165489).

Almost surely, 2^21103230 is an apocalyptic number.

21103230 is an abundant number, since it is smaller than the sum of its proper divisors (29544594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103230 is a wasteful number, since it uses less digits than its factorization.

21103230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703451.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21103230 is about 4593.8252034661. The cubic root of 21103230 is about 276.3437483393.

Adding to 21103230 its reverse (3230112), we get a palindrome (24333342).

The spelling of 21103230 in words is "twenty-one million, one hundred three thousand, two hundred thirty".