21431064798 has 144 divisors (see below), whose sum is σ = 57356601120. Its totient is φ = 5733889920.

The previous prime is 21431064797. The next prime is 21431064829. The reversal of 21431064798 is 89746013412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431064797) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 634768 + ... + 667676.

It is an arithmetic number, because the mean of its divisors is an integer number (398309730).

Almost surely, 2^21431064798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21431064798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28678300560).

21431064798 is an abundant number, since it is smaller than the sum of its proper divisors (35925536322).

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

21431064798 is a wasteful number, since it uses less digits than its factorization.

21431064798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32975 (or 32961 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 21431064798 in words is "twenty-one billion, four hundred thirty-one million, sixty-four thousand, seven hundred ninety-eight".