21211212221112 has 32 divisors (see below), whose sum is σ = 54461220570000. Its totient is φ = 6879312071424.

The previous prime is 21211212221093. The next prime is 21211212221123. The reversal of 21211212221112 is 21112221211212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11943249237 + ... + 11943251012.

Almost surely, 2^{21211212221112} is an apocalyptic number.

It is an amenable number.

21211212221112 is an abundant number, since it is smaller than the sum of its proper divisors (33250008348888).

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

21211212221112 is a wasteful number, since it uses less digits than its factorization.

21211212221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23886500295 (or 23886500291 counting only the distinct ones).

The product of its digits is 128, while the sum is 21.

Adding to 21211212221112 its reverse (21112221211212), we get a palindrome (42323433432324).

The spelling of 21211212221112 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, one hundred twelve".