21202212012 has 12 divisors (see below), whose sum is σ = 49471828056. Its totient is φ = 7067404000.

The previous prime is 21202212007. The next prime is 21202212019. The reversal of 21202212012 is 21021220212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21202212012³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202211982 and 21202212000.

It is not an unprimeable number, because it can be changed into a prime (21202212019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 883425489 + ... + 883425512.

It is an arithmetic number, because the mean of its divisors is an integer number (4122652338).

Almost surely, 2^21202212012 is an apocalyptic number.

It is an amenable number.

21202212012 is an abundant number, since it is smaller than the sum of its proper divisors (28269616044).

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

21202212012 is a wasteful number, since it uses less digits than its factorization.

21202212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766851008 (or 1766851006 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21202212012 its reverse (21021220212), we get a palindrome (42223432224).

The spelling of 21202212012 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, twelve".