21439755119 has 4 divisors (see below), whose sum is σ = 21440062800. Its totient is φ = 21439447440.

The previous prime is 21439755041. The next prime is 21439755133. The reversal of 21439755119 is 91155793412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21439755119 - 2⁸ = 21439754863 is a prime.

It is a super-2 number, since 2×21439755119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439755019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6134 + ... + 207164.

It is an arithmetic number, because the mean of its divisors is an integer number (5360015700).

Almost surely, 2^21439755119 is an apocalyptic number.

21439755119 is a deficient number, since it is larger than the sum of its proper divisors (307681).

21439755119 is a wasteful number, since it uses less digits than its factorization.

21439755119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307680.

The product of its digits is 340200, while the sum is 47.

The spelling of 21439755119 in words is "twenty-one billion, four hundred thirty-nine million, seven hundred fifty-five thousand, one hundred nineteen".