21103030 has 24 divisors (see below), whose sum is σ = 41135472. Its totient is φ = 7791264.

The previous prime is 21103021. The next prime is 21103051. The reversal of 21103030 is 3030112.

It is a Harshad number since it is a multiple of its sum of digits (10).

21103030 is a modest number, since divided by 3030 gives 2110 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21102998 and 21103016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4554 + ... + 7933.

It is an arithmetic number, because the mean of its divisors is an integer number (1713978).

Almost surely, 2^21103030 is an apocalyptic number.

21103030 is a deficient number, since it is larger than the sum of its proper divisors (20032442).

21103030 is a wasteful number, since it uses less digits than its factorization.

21103030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12520 (or 12507 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21103030 is about 4593.8034350634. The cubic root of 21103030 is about 276.3428753462.

Adding to 21103030 its reverse (3030112), we get a palindrome (24133142).

The spelling of 21103030 in words is "twenty-one million, one hundred three thousand, thirty".