21312410412 has 24 divisors (see below), whose sum is σ = 49836376576. Its totient is φ = 7088791248.

The previous prime is 21312410411. The next prime is 21312410513. The reversal of 21312410412 is 21401421312.

It is not an unprimeable number, because it can be changed into a prime (21312410411) 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 7 ways as a sum of consecutive naturals, for example, 1912408 + ... + 1923519.

Almost surely, 2^21312410412 is an apocalyptic number.

It is an amenable number.

21312410412 is an abundant number, since it is smaller than the sum of its proper divisors (28523966164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21312410412 is a wasteful number, since it uses less digits than its factorization.

21312410412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836397 (or 3836395 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21312410412 its reverse (21401421312), we get a palindrome (42713831724).

The spelling of 21312410412 in words is "twenty-one billion, three hundred twelve million, four hundred ten thousand, four hundred twelve".