21112211212 has 6 divisors (see below), whose sum is σ = 36946369628. Its totient is φ = 10556105604.

The previous prime is 21112211191. The next prime is 21112211279. The reversal of 21112211212 is 21211221112.

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639026398 + ... + 2639026405.

Almost surely, 2^21112211212 is an apocalyptic number.

It is an amenable number.

21112211212 is a deficient number, since it is larger than the sum of its proper divisors (15834158416).

21112211212 is a wasteful number, since it uses less digits than its factorization.

21112211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278052807 (or 5278052805 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 21112211212 its reverse (21211221112), we get a palindrome (42323432324).

It can be divided in two parts, 21112 and 211212, that added together give a square (232324 = 482²).

The spelling of 21112211212 in words is "twenty-one billion, one hundred twelve million, two hundred eleven thousand, two hundred twelve".