21210003111 has 8 divisors (see below), whose sum is σ = 30850913664. Its totient is φ = 12854547320.

The previous prime is 21210003079. The next prime is 21210003193. The reversal of 21210003111 is 11130001212.

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

It is a cyclic number.

It is not a de Polignac number, because 21210003111 - 2⁵ = 21210003079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210003011) 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, 321363651 + ... + 321363716.

It is an arithmetic number, because the mean of its divisors is an integer number (3856364208).

Almost surely, 2^21210003111 is an apocalyptic number.

21210003111 is a deficient number, since it is larger than the sum of its proper divisors (9640910553).

21210003111 is a wasteful number, since it uses less digits than its factorization.

21210003111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642727381.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21210003111 its reverse (11130001212), we get a palindrome (32340004323).

The spelling of 21210003111 in words is "twenty-one billion, two hundred ten million, three thousand, one hundred eleven".