21120112011 has 8 divisors (see below), whose sum is σ = 28188398224. Its totient is φ = 14065950240.

The previous prime is 21120112009. The next prime is 21120112033. The reversal of 21120112011 is 11021102112.

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

It is not a de Polignac number, because 21120112011 - 2¹ = 21120112009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120112081) 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, 3527620 + ... + 3533601.

It is an arithmetic number, because the mean of its divisors is an integer number (3523549778).

Almost surely, 2^21120112011 is an apocalyptic number.

21120112011 is a deficient number, since it is larger than the sum of its proper divisors (7068286213).

21120112011 is an equidigital number, since it uses as much as digits as its factorization.

21120112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062221.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21120112011 its reverse (11021102112), we get a palindrome (32141214123).

The spelling of 21120112011 in words is "twenty-one billion, one hundred twenty million, one hundred twelve thousand, eleven".