21120352143 has 16 divisors (see below), whose sum is σ = 30736368000. Its totient is φ = 12793606880.

The previous prime is 21120352051. The next prime is 21120352151. The reversal of 21120352143 is 34125302112.

It is a cyclic number.

It is not a de Polignac number, because 21120352143 - 2¹² = 21120348047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120352843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99873 + ... + 228506.

It is an arithmetic number, because the mean of its divisors is an integer number (1921023000).

Almost surely, 2^21120352143 is an apocalyptic number.

21120352143 is a deficient number, since it is larger than the sum of its proper divisors (9616015857).

21120352143 is a wasteful number, since it uses less digits than its factorization.

21120352143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330342.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21120352143 its reverse (34125302112), we get a palindrome (55245654255).

The spelling of 21120352143 in words is "twenty-one billion, one hundred twenty million, three hundred fifty-two thousand, one hundred forty-three".