21002222212 has 48 divisors (see below), whose sum is σ = 39828741120. Its totient is φ = 9653709312.

The previous prime is 21002222183. The next prime is 21002222233. The reversal of 21002222212 is 21222220012.

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 15 ways as a sum of consecutive naturals, for example, 613213 + ... + 646555.

It is an arithmetic number, because the mean of its divisors is an integer number (829765440).

Almost surely, 2^21002222212 is an apocalyptic number.

It is an amenable number.

21002222212 is a deficient number, since it is larger than the sum of its proper divisors (18826518908).

21002222212 is a wasteful number, since it uses less digits than its factorization.

21002222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33580 (or 33578 counting only the distinct ones).

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

Adding to 21002222212 its reverse (21222220012), we get a palindrome (42224442224).

The spelling of 21002222212 in words is "twenty-one billion, two million, two hundred twenty-two thousand, two hundred twelve".