21220010222112 has 144 divisors (see below), whose sum is σ = 64988405209728. Its totient is φ = 6529020526080.

The previous prime is 21220010222107. The next prime is 21220010222129. The reversal of 21220010222112 is 21122201002212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144710943 + ... + 144857505.

It is an arithmetic number, because the mean of its divisors is an integer number (451308369512).

Almost surely, 2^{21220010222112} is an apocalyptic number.

It is an amenable number.

21220010222112 is an abundant number, since it is smaller than the sum of its proper divisors (43768394987616).

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

21220010222112 is a wasteful number, since it uses less digits than its factorization.

21220010222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185263 (or 185252 counting only the distinct ones).

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

Adding to 21220010222112 its reverse (21122201002212), we get a palindrome (42342211224324).

The spelling of 21220010222112 in words is "twenty-one trillion, two hundred twenty billion, ten million, two hundred twenty-two thousand, one hundred twelve".