21112102011 has 64 divisors (see below), whose sum is σ = 37846803456. Its totient is φ = 10109836800.

The previous prime is 21112102007. The next prime is 21112102027. The reversal of 21112102011 is 11020121112.

It is not a de Polignac number, because 21112102011 - 2² = 21112102007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012102011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2388981 + ... + 2397801.

It is an arithmetic number, because the mean of its divisors is an integer number (591356304).

Almost surely, 2^21112102011 is an apocalyptic number.

21112102011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21112102011 is a deficient number, since it is larger than the sum of its proper divisors (16734701445).

21112102011 is a wasteful number, since it uses less digits than its factorization.

21112102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9652.

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

Adding to 21112102011 its reverse (11020121112), we get a palindrome (32132223123).

The spelling of 21112102011 in words is "twenty-one billion, one hundred twelve million, one hundred two thousand, eleven".