21431144204 has 6 divisors (see below), whose sum is σ = 37504502364. Its totient is φ = 10715572100.

The previous prime is 21431144191. The next prime is 21431144249. The reversal of 21431144204 is 40244113412.

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 as a sum of consecutive naturals, namely, 2678893022 + ... + 2678893029.

It is an arithmetic number, because the mean of its divisors is an integer number (6250750394).

Almost surely, 2^21431144204 is an apocalyptic number.

It is an amenable number.

21431144204 is a deficient number, since it is larger than the sum of its proper divisors (16073358160).

21431144204 is a wasteful number, since it uses less digits than its factorization.

21431144204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357786055 (or 5357786053 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21431144204 its reverse (40244113412), we get a palindrome (61675257616).

The spelling of 21431144204 in words is "twenty-one billion, four hundred thirty-one million, one hundred forty-four thousand, two hundred four".