21020130212 has 24 divisors (see below), whose sum is σ = 37442139840. Its totient is φ = 10323477920.

The previous prime is 21020130167. The next prime is 21020130221. The reversal of 21020130212 is 21203102012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61178 + ... + 213969.

It is an arithmetic number, because the mean of its divisors is an integer number (1560089160).

Almost surely, 2^21020130212 is an apocalyptic number.

It is an amenable number.

21020130212 is a deficient number, since it is larger than the sum of its proper divisors (16422009628).

21020130212 is a wasteful number, since it uses less digits than its factorization.

21020130212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275491 (or 275489 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21020130212 its reverse (21203102012), we get a palindrome (42223232224).

The spelling of 21020130212 in words is "twenty-one billion, twenty million, one hundred thirty thousand, two hundred twelve".