21112121112 has 32 divisors (see below), whose sum is σ = 53134542000. Its totient is φ = 6990141824.

The previous prime is 21112121089. The next prime is 21112121119.

It is a happy number.

21112121112 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21112121112² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21112121091 and 21112121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112121119) 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, 2948343 + ... + 2955494.

Almost surely, 2^21112121112 is an apocalyptic number.

It is an amenable number.

21112121112 is an abundant number, since it is smaller than the sum of its proper divisors (32022420888).

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

21112121112 is a wasteful number, since it uses less digits than its factorization.

21112121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5903995 (or 5903991 counting only the distinct ones).

The product of its digits is 16, while the sum is 15.

The spelling of 21112121112 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, one hundred twelve".