21222011220012 has 48 divisors (see below), whose sum is σ = 57915820099200. Its totient is φ = 6701687753040.

The previous prime is 21222011219989. The next prime is 21222011220017. The reversal of 21222011220012 is 21002211022212.

It is a happy number.

21222011220012 is a `hidden beast` number, since 212 + 220 + 1 + 1 + 220 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21222011220017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5171053314 + ... + 5171057417.

It is an arithmetic number, because the mean of its divisors is an integer number (1206579585400).

Almost surely, 2^{21222011220012} is an apocalyptic number.

It is an amenable number.

21222011220012 is an abundant number, since it is smaller than the sum of its proper divisors (36693808879188).

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

21222011220012 is a wasteful number, since it uses less digits than its factorization.

21222011220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342110763 (or 10342110755 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222011220012 its reverse (21002211022212), we get a palindrome (42224222242224).

The spelling of 21222011220012 in words is "twenty-one trillion, two hundred twenty-two billion, eleven million, two hundred twenty thousand, twelve".