21021200222112 has 72 divisors (see below), whose sum is σ = 63295452154116. Its totient is φ = 6594886342656.

The previous prime is 21021200222111. The next prime is 21021200222117. The reversal of 21021200222112 is 21122200212012.

It is a happy number.

21021200222112 is a `hidden beast` number, since 210 + 2 + 120 + 0 + 222 + 112 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20578235432976 + 442964789136 = 4536324^2 + 665556^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 (21021200222111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2146768003 + ... + 2146777794.

Almost surely, 2^{21021200222112} is an apocalyptic number.

It is an amenable number.

21021200222112 is an abundant number, since it is smaller than the sum of its proper divisors (42274251932004).

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

21021200222112 is a wasteful number, since it uses less digits than its factorization.

21021200222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293545830 (or 4293545819 counting only the distinct ones).

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

Adding to 21021200222112 its reverse (21122200212012), we get a palindrome (42143400434124).

The spelling of 21021200222112 in words is "twenty-one trillion, twenty-one billion, two hundred million, two hundred twenty-two thousand, one hundred twelve".