21110112011 has 8 divisors (see below), whose sum is σ = 22058260224. Its totient is φ = 20164490280.

The previous prime is 21110111999. The next prime is 21110112029. The reversal of 21110112011 is 11021101112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110112011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110111983 and 21110112001.

It is not an unprimeable number, because it can be changed into a prime (21110112061) 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, 614525 + ... + 647966.

It is an arithmetic number, because the mean of its divisors is an integer number (2757282528).

Almost surely, 2^21110112011 is an apocalyptic number.

21110112011 is a deficient number, since it is larger than the sum of its proper divisors (948148213).

21110112011 is a wasteful number, since it uses less digits than its factorization.

21110112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263241.

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

Adding to 21110112011 its reverse (11021101112), we get a palindrome (32131213123).

The spelling of 21110112011 in words is "twenty-one billion, one hundred ten million, one hundred twelve thousand, eleven".