21144434335 has 32 divisors (see below), whose sum is σ = 28560081600. Its totient is φ = 14933145600.

The previous prime is 21144434309. The next prime is 21144434341. The reversal of 21144434335 is 53343444112.

It is not a de Polignac number, because 21144434335 - 2⁵ = 21144434303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21144434335.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98301 + ... + 227929.

It is an arithmetic number, because the mean of its divisors is an integer number (892502550).

Almost surely, 2^21144434335 is an apocalyptic number.

21144434335 is a deficient number, since it is larger than the sum of its proper divisors (7415647265).

21144434335 is a wasteful number, since it uses less digits than its factorization.

21144434335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129771.

The product of its digits is 69120, while the sum is 34.

Adding to 21144434335 its reverse (53343444112), we get a palindrome (74487878447).

The spelling of 21144434335 in words is "twenty-one billion, one hundred forty-four million, four hundred thirty-four thousand, three hundred thirty-five".