21220211122212 has 48 divisors (see below), whose sum is σ = 50724150446592. Its totient is φ = 6900518373120.

The previous prime is 21220211122211. The next prime is 21220211122223. The reversal of 21220211122212 is 21222111202212.

It is not an unprimeable number, because it can be changed into a prime (21220211122211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8299533 + ... + 10550955.

It is an arithmetic number, because the mean of its divisors is an integer number (1056753134304).

Almost surely, 2^{21220211122212} is an apocalyptic number.

It is an amenable number.

21220211122212 is an abundant number, since it is smaller than the sum of its proper divisors (29503939324380).

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

21220211122212 is a wasteful number, since it uses less digits than its factorization.

21220211122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270628 (or 2270626 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21220211122212 its reverse (21222111202212), we get a palindrome (42442322324424).

The spelling of 21220211122212 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twelve".