21202122212 has 24 divisors (see below), whose sum is σ = 38061757440. Its totient is φ = 10328056640.

The previous prime is 21202122197. The next prime is 21202122233. The reversal of 21202122212 is 21222120212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28013 + ... + 207819.

It is an arithmetic number, because the mean of its divisors is an integer number (1585906560).

Almost surely, 2^21202122212 is an apocalyptic number.

It is an amenable number.

21202122212 is a deficient number, since it is larger than the sum of its proper divisors (16859635228).

21202122212 is a wasteful number, since it uses less digits than its factorization.

21202122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180571 (or 180569 counting only the distinct ones).

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

Adding to 21202122212 its reverse (21222120212), we get a palindrome (42424242424).

The spelling of 21202122212 in words is "twenty-one billion, two hundred two million, one hundred twenty-two thousand, two hundred twelve".