21112120011 has 8 divisors (see below), whose sum is σ = 28680616080. Its totient is φ = 13809185312.

The previous prime is 21112119989. The next prime is 21112120019. The reversal of 21112120011 is 11002121112.

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 21112120011 - 2⁷ = 21112119883 is a prime.

It is a super-2 number, since 2×21112120011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21112120019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66390156 + ... + 66390473.

It is an arithmetic number, because the mean of its divisors is an integer number (3585077010).

Almost surely, 2^21112120011 is an apocalyptic number.

21112120011 is a deficient number, since it is larger than the sum of its proper divisors (7568496069).

21112120011 is a wasteful number, since it uses less digits than its factorization.

21112120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132780685.

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

Adding to 21112120011 its reverse (11002121112), we get a palindrome (32114241123).

It can be divided in two parts, 211121 and 20011, that added together give a palindrome (231132).

The spelling of 21112120011 in words is "twenty-one billion, one hundred twelve million, one hundred twenty thousand, eleven".