21204315412 has 24 divisors (see below), whose sum is σ = 42431377856. Its totient is φ = 9082689408.

The previous prime is 21204315403. The next prime is 21204315413. The reversal of 21204315412 is 21451340212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204315413) 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, 149718 + ... + 254605.

Almost surely, 2^21204315412 is an apocalyptic number.

It is an amenable number.

21204315412 is an abundant number, since it is smaller than the sum of its proper divisors (21227062444).

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

21204315412 is a wasteful number, since it uses less digits than its factorization.

21204315412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406207 (or 406205 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21204315412 its reverse (21451340212), we get a palindrome (42655655624).

The spelling of 21204315412 in words is "twenty-one billion, two hundred four million, three hundred fifteen thousand, four hundred twelve".