21221011022212 has 24 divisors (see below), whose sum is σ = 38455659406080. Its totient is φ = 10235839224480.

The previous prime is 21221011022209. The next prime is 21221011022293. The reversal of 21221011022212 is 21222011012212.

It is a self number, because there is not a number n which added to its sum of digits gives 21221011022212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269893162 + ... + 269971777.

It is an arithmetic number, because the mean of its divisors is an integer number (1602319141920).

Almost surely, 2^{21221011022212} is an apocalyptic number.

It is an amenable number.

21221011022212 is a deficient number, since it is larger than the sum of its proper divisors (17234648383868).

21221011022212 is a wasteful number, since it uses less digits than its factorization.

21221011022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539865291 (or 539865289 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221011022212 its reverse (21222011012212), we get a palindrome (42443022034424).

The spelling of 21221011022212 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, twenty-two thousand, two hundred twelve".