21130013204 has 6 divisors (see below), whose sum is σ = 36977523114. Its totient is φ = 10565006600.

The previous prime is 21130013197. The next prime is 21130013207. The reversal of 21130013204 is 40231003112.

It can be written as a sum of positive squares in only one way, i.e., 16204780804 + 4925232400 = 127298^2 + 70180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130013207) 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 as a sum of consecutive naturals, namely, 2641251647 + ... + 2641251654.

It is an arithmetic number, because the mean of its divisors is an integer number (6162920519).

Almost surely, 2^21130013204 is an apocalyptic number.

It is an amenable number.

21130013204 is a deficient number, since it is larger than the sum of its proper divisors (15847509910).

21130013204 is a wasteful number, since it uses less digits than its factorization.

21130013204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282503305 (or 5282503303 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130013204 its reverse (40231003112), we get a palindrome (61361016316).

The spelling of 21130013204 in words is "twenty-one billion, one hundred thirty million, thirteen thousand, two hundred four".