21021202212 has 24 divisors (see below), whose sum is σ = 49051896096. Its totient is φ = 7006721088.

The previous prime is 21021202201. The next prime is 21021202243. The reversal of 21021202212 is 21220212012.

It is a junction number, because it is equal to n+sod(n) for n = 21021202191 and 21021202200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359623 + ... + 413969.

It is an arithmetic number, because the mean of its divisors is an integer number (2043829004).

Almost surely, 2^21021202212 is an apocalyptic number.

It is an amenable number.

21021202212 is an abundant number, since it is smaller than the sum of its proper divisors (28030693884).

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

21021202212 is a wasteful number, since it uses less digits than its factorization.

21021202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86587 (or 86585 counting only the distinct ones).

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

Adding to 21021202212 its reverse (21220212012), we get a palindrome (42241414224).

The spelling of 21021202212 in words is "twenty-one billion, twenty-one million, two hundred two thousand, two hundred twelve".