21121035143 has 4 divisors (see below), whose sum is σ = 22745730168. Its totient is φ = 19496340120.

The previous prime is 21121035049. The next prime is 21121035163. The reversal of 21121035143 is 34153012112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121035143 - 2¹⁶ = 21120969607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121035163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812347493 + ... + 812347518.

It is an arithmetic number, because the mean of its divisors is an integer number (5686432542).

Almost surely, 2^21121035143 is an apocalyptic number.

21121035143 is a deficient number, since it is larger than the sum of its proper divisors (1624695025).

21121035143 is a wasteful number, since it uses less digits than its factorization.

21121035143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624695024.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21121035143 its reverse (34153012112), we get a palindrome (55274047255).

The spelling of 21121035143 in words is "twenty-one billion, one hundred twenty-one million, thirty-five thousand, one hundred forty-three".