21211121112 has 32 divisors (see below), whose sum is σ = 53031499200. Its totient is φ = 7069880864.

The previous prime is 21211121089. The next prime is 21211121137. The reversal of 21211121112 is 21112111212.

It is a happy number.

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 = 21211121091 and 21211121100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526303 + ... + 565169.

It is an arithmetic number, because the mean of its divisors is an integer number (1657234350).

Almost surely, 2^21211121112 is an apocalyptic number.

It is an amenable number.

21211121112 is an abundant number, since it is smaller than the sum of its proper divisors (31820378088).

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

21211121112 is a wasteful number, since it uses less digits than its factorization.

21211121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61615 (or 61611 counting only the distinct ones).

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

Adding to 21211121112 its reverse (21112111212), we get a palindrome (42323232324).

The spelling of 21211121112 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twelve".