21404143312 has 10 divisors (see below), whose sum is σ = 41470527698. Its totient is φ = 10702071648.

The previous prime is 21404143309. The next prime is 21404143349. The reversal of 21404143312 is 21334140412.

It can be written as a sum of positive squares in only one way, i.e., 16064041536 + 5340101776 = 126744^2 + 73076^2 .

It is a congruent number.

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, 668879463 + ... + 668879494.

Almost surely, 2^21404143312 is an apocalyptic number.

It is an amenable number.

21404143312 is a deficient number, since it is larger than the sum of its proper divisors (20066384386).

21404143312 is a wasteful number, since it uses less digits than its factorization.

21404143312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337758965 (or 1337758959 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21404143312 its reverse (21334140412), we get a palindrome (42738283724).

The spelling of 21404143312 in words is "twenty-one billion, four hundred four million, one hundred forty-three thousand, three hundred twelve".