21212202121012 has 48 divisors (see below), whose sum is σ = 42533212462720. Its totient is φ = 9067633039872.

The previous prime is 21212202121009. The next prime is 21212202121057. The reversal of 21212202121012 is 21012120221212.

It is a congruent number.

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, 99674983 + ... + 99887569.

Almost surely, 2^{21212202121012} is an apocalyptic number.

It is an amenable number.

21212202121012 is an abundant number, since it is smaller than the sum of its proper divisors (21321010341708).

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

21212202121012 is a wasteful number, since it uses less digits than its factorization.

21212202121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221720 (or 221718 counting only the distinct ones).

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

Adding to 21212202121012 its reverse (21012120221212), we get a palindrome (42224322342224).

The spelling of 21212202121012 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred twenty-one thousand, twelve".