21210220020012 has 48 divisors (see below), whose sum is σ = 49947072602112. Its totient is φ = 7004897186560.

The previous prime is 21210220019977. The next prime is 21210220020019. The reversal of 21210220020012 is 21002002201212.

It is a junction number, because it is equal to n+sod(n) for n = 21210220019973 and 21210220020000.

It is not an unprimeable number, because it can be changed into a prime (21210220020019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 732937 + ... + 6554207.

It is an arithmetic number, because the mean of its divisors is an integer number (1040564012544).

Almost surely, 2^{21210220020012} is an apocalyptic number.

It is an amenable number.

21210220020012 is an abundant number, since it is smaller than the sum of its proper divisors (28736852582100).

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

21210220020012 is a wasteful number, since it uses less digits than its factorization.

21210220020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5824078 (or 5824076 counting only the distinct ones).

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

Adding to 21210220020012 its reverse (21002002201212), we get a palindrome (42212222221224).

The spelling of 21210220020012 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, twenty thousand, twelve".