21102221111 has 8 divisors (see below), whose sum is σ = 21517143648. Its totient is φ = 20689524000.

The previous prime is 21102221093. The next prime is 21102221143. The reversal of 21102221111 is 11112220112.

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 21102221111 - 2¹⁴ = 21102204727 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 (21102221191) 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, 537200 + ... + 575141.

It is an arithmetic number, because the mean of its divisors is an integer number (2689642956).

Almost surely, 2^21102221111 is an apocalyptic number.

21102221111 is a deficient number, since it is larger than the sum of its proper divisors (414922537).

21102221111 is a wasteful number, since it uses less digits than its factorization.

21102221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112713.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102221111 its reverse (11112220112), we get a palindrome (32214441223).

Subtracting from 21102221111 its reverse (11112220112), we obtain a palindrome (9990000999).

The spelling of 21102221111 in words is "twenty-one billion, one hundred two million, two hundred twenty-one thousand, one hundred eleven".