21443131234 has 16 divisors (see below), whose sum is σ = 36798493248. Its totient is φ = 9180203472.

The previous prime is 21443131223. The next prime is 21443131247. The reversal of 21443131234 is 43213134412.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 795429 + ... + 821944.

It is an arithmetic number, because the mean of its divisors is an integer number (2299905828).

Almost surely, 2^21443131234 is an apocalyptic number.

21443131234 is a deficient number, since it is larger than the sum of its proper divisors (15355362014).

21443131234 is a wasteful number, since it uses less digits than its factorization.

21443131234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618329.

The product of its digits is 6912, while the sum is 28.

Adding to 21443131234 its reverse (43213134412), we get a palindrome (64656265646).

The spelling of 21443131234 in words is "twenty-one billion, four hundred forty-three million, one hundred thirty-one thousand, two hundred thirty-four".