21111011112 has 64 divisors (see below), whose sum is σ = 56105467200. Its totient is φ = 6600614400.

The previous prime is 21111011107. The next prime is 21111011147.

21111011112 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183133 + ... + 275244.

It is an arithmetic number, because the mean of its divisors is an integer number (876647925).

Almost surely, 2^21111011112 is an apocalyptic number.

It is an amenable number.

21111011112 is an abundant number, since it is smaller than the sum of its proper divisors (34994456088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111011112 is a wasteful number, since it uses less digits than its factorization.

21111011112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458506 (or 458502 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

It can be divided in two parts, 211110 and 11112, that added together give a palindrome (222222).

The spelling of 21111011112 in words is "twenty-one billion, one hundred eleven million, eleven thousand, one hundred twelve".