21130012033 has 12 divisors (see below), whose sum is σ = 22939317180. Its totient is φ = 19454425536.

The previous prime is 21130011983. The next prime is 21130012039. The reversal of 21130012033 is 33021003112.

It can be written as a sum of positive squares in 6 ways, for example, as 12524295744 + 8605716289 = 111912^2 + 92767^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21130012033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21130011998 and 21130012016.

It is not an unprimeable number, because it can be changed into a prime (21130012039) 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 11 ways as a sum of consecutive naturals, for example, 94966 + ... + 226447.

It is an arithmetic number, because the mean of its divisors is an integer number (1911609765).

Almost surely, 2^21130012033 is an apocalyptic number.

It is an amenable number.

21130012033 is a deficient number, since it is larger than the sum of its proper divisors (1809305147).

21130012033 is a wasteful number, since it uses less digits than its factorization.

21130012033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321828 (or 321815 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21130012033 its reverse (33021003112), we get a palindrome (54151015145).

The spelling of 21130012033 in words is "twenty-one billion, one hundred thirty million, twelve thousand, thirty-three".