21210224111 has 8 divisors (see below), whose sum is σ = 22134073344. Its totient is φ = 20286513720.

The previous prime is 21210224089. The next prime is 21210224117. The reversal of 21210224111 is 11142201212.

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 21210224111 - 2⁶ = 21210224047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210224111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210224117) 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, 386210 + ... + 437696.

It is an arithmetic number, because the mean of its divisors is an integer number (2766759168).

Almost surely, 2^21210224111 is an apocalyptic number.

21210224111 is a deficient number, since it is larger than the sum of its proper divisors (923849233).

21210224111 is a wasteful number, since it uses less digits than its factorization.

21210224111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69421.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210224111 its reverse (11142201212), we get a palindrome (32352425323).

The spelling of 21210224111 in words is "twenty-one billion, two hundred ten million, two hundred twenty-four thousand, one hundred eleven".