21130232005 has 12 divisors (see below), whose sum is σ = 25518960900. Its totient is φ = 16796417664.

The previous prime is 21130231943. The next prime is 21130232027. The reversal of 21130232005 is 50023203112.

It can be written as a sum of positive squares in 6 ways, for example, as 490312449 + 20639919556 = 22143^2 + 143666^2 .

It is not a de Polignac number, because 21130232005 - 2⁷ = 21130231877 is a prime.

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, 37521 + ... + 208969.

It is an arithmetic number, because the mean of its divisors is an integer number (2126580075).

Almost surely, 2^21130232005 is an apocalyptic number.

It is an amenable number.

21130232005 is a deficient number, since it is larger than the sum of its proper divisors (4388728895).

21130232005 is an equidigital number, since it uses as much as digits as its factorization.

21130232005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171768 (or 171611 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 21130232005 its reverse (50023203112), we get a palindrome (71153435117).

The spelling of 21130232005 in words is "twenty-one billion, one hundred thirty million, two hundred thirty-two thousand, five".