21222020111012 has 24 divisors (see below), whose sum is σ = 42856118288256. Its totient is φ = 9006849033408.

The previous prime is 21222020110961. The next prime is 21222020111023. The reversal of 21222020111012 is 21011102022212.

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, 3679265513 + ... + 3679271280.

It is an arithmetic number, because the mean of its divisors is an integer number (1785671595344).

Almost surely, 2^{21222020111012} is an apocalyptic number.

It is an amenable number.

21222020111012 is an abundant number, since it is smaller than the sum of its proper divisors (21634098177244).

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

21222020111012 is a wasteful number, since it uses less digits than its factorization.

21222020111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7358536907 (or 7358536905 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222020111012 its reverse (21011102022212), we get a palindrome (42233122133224).

The spelling of 21222020111012 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, one hundred eleven thousand, twelve".