21130130212 has 12 divisors (see below), whose sum is σ = 39152888460. Its totient is φ = 9943590656.

The previous prime is 21130130201. The next prime is 21130130221. The reversal of 21130130212 is 21203103112.

It can be written as a sum of positive squares in 2 ways, for example, as 8066554596 + 13063575616 = 89814^2 + 114296^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 155368537 + ... + 155368672.

It is an arithmetic number, because the mean of its divisors is an integer number (3262740705).

Almost surely, 2^21130130212 is an apocalyptic number.

It is an amenable number.

21130130212 is a deficient number, since it is larger than the sum of its proper divisors (18022758248).

21130130212 is a wasteful number, since it uses less digits than its factorization.

21130130212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310737230 (or 310737228 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21130130212 its reverse (21203103112), we get a palindrome (42333233324).

The spelling of 21130130212 in words is "twenty-one billion, one hundred thirty million, one hundred thirty thousand, two hundred twelve".