21321130412 has 12 divisors (see below), whose sum is σ = 37315121256. Its totient is φ = 10659667200.

The previous prime is 21321130361. The next prime is 21321130423. The reversal of 21321130412 is 21403112312.

It is a super-2 number, since 2×21321130412² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 169589 + ... + 267212.

It is an arithmetic number, because the mean of its divisors is an integer number (3109593438).

Almost surely, 2^21321130412 is an apocalyptic number.

It is an amenable number.

21321130412 is a deficient number, since it is larger than the sum of its proper divisors (15993990844).

21321130412 is a wasteful number, since it uses less digits than its factorization.

21321130412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449008 (or 449006 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21321130412 its reverse (21403112312), we get a palindrome (42724242724).

The spelling of 21321130412 in words is "twenty-one billion, three hundred twenty-one million, one hundred thirty thousand, four hundred twelve".