21143210111 has 8 divisors (see below), whose sum is σ = 21289716000. Its totient is φ = 20996765920.

The previous prime is 21143210083. The next prime is 21143210117. The reversal of 21143210111 is 11101234112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21143210111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21143210111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143210117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832166 + ... + 857196.

It is an arithmetic number, because the mean of its divisors is an integer number (2661214500).

Almost surely, 2^21143210111 is an apocalyptic number.

21143210111 is a deficient number, since it is larger than the sum of its proper divisors (146505889).

21143210111 is a wasteful number, since it uses less digits than its factorization.

21143210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30849.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21143210111 its reverse (11101234112), we get a palindrome (32244444223).

The spelling of 21143210111 in words is "twenty-one billion, one hundred forty-three million, two hundred ten thousand, one hundred eleven".