21112100011 has 4 divisors (see below), whose sum is σ = 21114175392. Its totient is φ = 21110024632.

The previous prime is 21112099969. The next prime is 21112100017. The reversal of 21112100011 is 11000121112.

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-21112100011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112100017) 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, 1022356 + ... + 1042801.

It is an arithmetic number, because the mean of its divisors is an integer number (5278543848).

Almost surely, 2^21112100011 is an apocalyptic number.

21112100011 is a deficient number, since it is larger than the sum of its proper divisors (2075381).

21112100011 is a wasteful number, since it uses less digits than its factorization.

21112100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075380.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21112100011 its reverse (11000121112), we get a palindrome (32112221123).

The spelling of 21112100011 in words is "twenty-one billion, one hundred twelve million, one hundred thousand, eleven".