21112011101 has 4 divisors (see below), whose sum is σ = 22223169600. Its totient is φ = 20000852604.

The previous prime is 21112011097. The next prime is 21112011133. The reversal of 21112011101 is 10111021112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21112011101 - 2² = 21112011097 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 (21112011181) 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, 555579221 + ... + 555579258.

It is an arithmetic number, because the mean of its divisors is an integer number (5555792400).

Almost surely, 2^21112011101 is an apocalyptic number.

It is an amenable number.

21112011101 is a deficient number, since it is larger than the sum of its proper divisors (1111158499).

21112011101 is a wasteful number, since it uses less digits than its factorization.

21112011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111158498.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21112011101 its reverse (10111021112), we get a palindrome (31223032213).

The spelling of 21112011101 in words is "twenty-one billion, one hundred twelve million, eleven thousand, one hundred one".