21110332111 has 4 divisors (see below), whose sum is σ = 23029453224. Its totient is φ = 19191211000.

The previous prime is 21110332081. The next prime is 21110332157. The reversal of 21110332111 is 11123301112.

It is a happy number.

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 21110332111 - 2¹¹ = 21110330063 is a prime.

It is a super-2 number, since 2×21110332111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110332171) 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, 959560540 + ... + 959560561.

It is an arithmetic number, because the mean of its divisors is an integer number (5757363306).

Almost surely, 2^21110332111 is an apocalyptic number.

21110332111 is a deficient number, since it is larger than the sum of its proper divisors (1919121113).

21110332111 is a wasteful number, since it uses less digits than its factorization.

21110332111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919121112.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21110332111 its reverse (11123301112), we get a palindrome (32233633223).

The spelling of 21110332111 in words is "twenty-one billion, one hundred ten million, three hundred thirty-two thousand, one hundred eleven".