21210220022012 has 48 divisors (see below), whose sum is σ = 43232328925632. Its totient is φ = 8916209402880.

The previous prime is 21210220021997. The next prime is 21210220022053. The reversal of 21210220022012 is 21022002201212.

It is a happy number.

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, 3681218 + ... + 7481430.

It is an arithmetic number, because the mean of its divisors is an integer number (900673519284).

Almost surely, 2^{21210220022012} is an apocalyptic number.

It is an amenable number.

21210220022012 is an abundant number, since it is smaller than the sum of its proper divisors (22022108903620).

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

21210220022012 is a wasteful number, since it uses less digits than its factorization.

21210220022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804038 (or 3804036 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21210220022012 its reverse (21022002201212), we get a palindrome (42232222223224).

The spelling of 21210220022012 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, twenty-two thousand, twelve".