21000110111 has 8 divisors (see below), whose sum is σ = 21063120000. Its totient is φ = 20937184920.

The previous prime is 21000110057. The next prime is 21000110123. The reversal of 21000110111 is 11101100012.

It is a happy number.

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 21000110111 - 2³⁴ = 3820240927 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 (21000110171) 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, 494060 + ... + 534878.

It is an arithmetic number, because the mean of its divisors is an integer number (2632890000).

Almost surely, 2^21000110111 is an apocalyptic number.

21000110111 is a deficient number, since it is larger than the sum of its proper divisors (63009889).

21000110111 is a wasteful number, since it uses less digits than its factorization.

21000110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42349.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21000110111 its reverse (11101100012), we get a palindrome (32101210123).

The spelling of 21000110111 in words is "twenty-one billion, one hundred ten thousand, one hundred eleven".