21100231010111 has 4 divisors (see below), whose sum is σ = 23018433829224. Its totient is φ = 19182028191000.

The previous prime is 21100231010083. The next prime is 21100231010179. The reversal of 21100231010111 is 11101013200112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100231010111 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 (21100231090111) 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, 959101409540 + ... + 959101409561.

It is an arithmetic number, because the mean of its divisors is an integer number (5754608457306).

Almost surely, 2^{21100231010111} is an apocalyptic number.

21100231010111 is a deficient number, since it is larger than the sum of its proper divisors (1918202819113).

21100231010111 is a wasteful number, since it uses less digits than its factorization.

21100231010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918202819112.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21100231010111 its reverse (11101013200112), we get a palindrome (32201244210223).

The spelling of 21100231010111 in words is "twenty-one trillion, one hundred billion, two hundred thirty-one million, ten thousand, one hundred eleven".