21112212012 has 48 divisors (see below), whose sum is σ = 49442445024. Its totient is φ = 7011648000.

The previous prime is 21112211993. The next prime is 21112212067. The reversal of 21112212012 is 21021221112.

It is a junction number, because it is equal to n+sod(n) for n = 21112211982 and 21112212000.

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, 4751712 + ... + 4756152.

It is an arithmetic number, because the mean of its divisors is an integer number (1030050938).

Almost surely, 2^21112212012 is an apocalyptic number.

It is an amenable number.

21112212012 is an abundant number, since it is smaller than the sum of its proper divisors (28330233012).

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

21112212012 is a wasteful number, since it uses less digits than its factorization.

21112212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810 (or 5808 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112212012 its reverse (21021221112), we get a palindrome (42133433124).

The spelling of 21112212012 in words is "twenty-one billion, one hundred twelve million, two hundred twelve thousand, twelve".