21030113 has 8 divisors (see below), whose sum is σ = 22713768. Its totient is φ = 19355904.

The previous prime is 21030109. The next prime is 21030127. The reversal of 21030113 is 31103012.

It can be written as a sum of positive squares in 4 ways, for example, as 300304 + 20729809 = 548^2 + 4553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21030113 - 2² = 21030109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030094 and 21030103.

It is not an unprimeable number, because it can be changed into a prime (21030193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2681 + ... + 7017.

It is an arithmetic number, because the mean of its divisors is an integer number (2839221).

Almost surely, 2^21030113 is an apocalyptic number.

It is an amenable number.

21030113 is a deficient number, since it is larger than the sum of its proper divisors (1683655).

21030113 is a wasteful number, since it uses less digits than its factorization.

21030113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4723.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21030113 is about 4585.8601156163. The cubic root of 21030113 is about 276.0242268518.

Adding to 21030113 its reverse (31103012), we get a palindrome (52133125).

The spelling of 21030113 in words is "twenty-one million, thirty thousand, one hundred thirteen".