21432431312 has 40 divisors (see below), whose sum is σ = 43381390080. Its totient is φ = 10245565440.

The previous prime is 21432431311. The next prime is 21432431327. The reversal of 21432431312 is 21313423412.

It is a super-2 number, since 2×21432431312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432431311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219137 + ... + 301472.

It is an arithmetic number, because the mean of its divisors is an integer number (1084534752).

Almost surely, 2^21432431312 is an apocalyptic number.

It is an amenable number.

21432431312 is an abundant number, since it is smaller than the sum of its proper divisors (21948958768).

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

21432431312 is a wasteful number, since it uses less digits than its factorization.

21432431312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520731 (or 520725 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 21432431312 its reverse (21313423412), we get a palindrome (42745854724).

The spelling of 21432431312 in words is "twenty-one billion, four hundred thirty-two million, four hundred thirty-one thousand, three hundred twelve".