21112122220212 has 24 divisors (see below), whose sum is σ = 50850702982912. Its totient is φ = 6810362006400.

The previous prime is 21112122220193. The next prime is 21112122220247. The reversal of 21112122220212 is 21202222121112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28376507989 + ... + 28376508732.

Almost surely, 2^{21112122220212} is an apocalyptic number.

It is an amenable number.

21112122220212 is an abundant number, since it is smaller than the sum of its proper divisors (29738580762700).

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

21112122220212 is a wasteful number, since it uses less digits than its factorization.

21112122220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56753016759 (or 56753016757 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21112122220212 its reverse (21202222121112), we get a palindrome (42314344341324).

The spelling of 21112122220212 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twelve".