21030825113 has 8 divisors (see below), whose sum is σ = 21436851528. Its totient is φ = 20625140224.

The previous prime is 21030825083. The next prime is 21030825139. The reversal of 21030825113 is 31152803012.

It can be written as a sum of positive squares in 4 ways, for example, as 6710394889 + 14320430224 = 81917^2 + 119668^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030825113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030875113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40745 + ... + 209097.

It is an arithmetic number, because the mean of its divisors is an integer number (2679606441).

Almost surely, 2^21030825113 is an apocalyptic number.

It is an amenable number.

21030825113 is a deficient number, since it is larger than the sum of its proper divisors (406026415).

21030825113 is a wasteful number, since it uses less digits than its factorization.

21030825113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170763.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 21030825113 in words is "twenty-one billion, thirty million, eight hundred twenty-five thousand, one hundred thirteen".