21213431443432 has 32 divisors (see below), whose sum is σ = 39791407874400. Its totient is φ = 10602390262464.

The previous prime is 21213431443423. The next prime is 21213431443493. The reversal of 21213431443432 is 23434413431212.

It is a junction number, because it is equal to n+sod(n) for n = 21213431443391 and 21213431443400.

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, 202406419 + ... + 202511197.

It is an arithmetic number, because the mean of its divisors is an integer number (1243481496075).

Almost surely, 2^{21213431443432} is an apocalyptic number.

It is an amenable number.

21213431443432 is a deficient number, since it is larger than the sum of its proper divisors (18577976430968).

21213431443432 is a wasteful number, since it uses less digits than its factorization.

21213431443432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114865 (or 114861 counting only the distinct ones).

The product of its digits is 165888, while the sum is 37.

Adding to 21213431443432 its reverse (23434413431212), we get a palindrome (44647844874644).

The spelling of 21213431443432 in words is "twenty-one trillion, two hundred thirteen billion, four hundred thirty-one million, four hundred forty-three thousand, four hundred thirty-two".