21202022212 has 96 divisors (see below), whose sum is σ = 44394577920. Its totient is φ = 8672227200.

The previous prime is 21202022183. The next prime is 21202022227. The reversal of 21202022212 is 21222020212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9605613 + ... + 9607819.

It is an arithmetic number, because the mean of its divisors is an integer number (462443520).

Almost surely, 2^21202022212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202022212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22197288960).

21202022212 is an abundant number, since it is smaller than the sum of its proper divisors (23192555708).

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

21202022212 is a wasteful number, since it uses less digits than its factorization.

21202022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21202022212 its reverse (21222020212), we get a palindrome (42424042424).

The spelling of 21202022212 in words is "twenty-one billion, two hundred two million, twenty-two thousand, two hundred twelve".