21112020221212 has 6 divisors (see below), whose sum is σ = 36946035387128. Its totient is φ = 10556010110604.

The previous prime is 21112020221183. The next prime is 21112020221231. The reversal of 21112020221212 is 21212202021112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112020221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639002527648 + ... + 2639002527655.

Almost surely, 2^{21112020221212} is an apocalyptic number.

It is an amenable number.

21112020221212 is a deficient number, since it is larger than the sum of its proper divisors (15834015165916).

21112020221212 is a wasteful number, since it uses less digits than its factorization.

21112020221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278005055307 (or 5278005055305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112020221212 its reverse (21212202021112), we get a palindrome (42324222242324).

The spelling of 21112020221212 in words is "twenty-one trillion, one hundred twelve billion, twenty million, two hundred twenty-one thousand, two hundred twelve".