21431434232 has 32 divisors (see below), whose sum is σ = 44008498800. Its totient is φ = 9723777024.

The previous prime is 21431434163. The next prime is 21431434253. The reversal of 21431434232 is 23243413412.

It is a junction number, because it is equal to n+sod(n) for n = 21431434195 and 21431434204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740233 + ... + 1752504.

Almost surely, 2^21431434232 is an apocalyptic number.

It is an amenable number.

21431434232 is an abundant number, since it is smaller than the sum of its proper divisors (22577064568).

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

21431434232 is a wasteful number, since it uses less digits than its factorization.

21431434232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492815 (or 3492811 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

Adding to 21431434232 its reverse (23243413412), we get a palindrome (44674847644).

The spelling of 21431434232 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty-four thousand, two hundred thirty-two".