21010020222112 has 12 divisors (see below), whose sum is σ = 41363477312346. Its totient is φ = 10505010111040.

The previous prime is 21010020222101. The next prime is 21010020222151. The reversal of 21010020222112 is 21122202001012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20878283164176 + 131737057936 = 4569276^2 + 362956^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328281565939 + ... + 328281566002.

Almost surely, 2^{21010020222112} is an apocalyptic number.

It is an amenable number.

21010020222112 is a deficient number, since it is larger than the sum of its proper divisors (20353457090234).

21010020222112 is an equidigital number, since it uses as much as digits as its factorization.

21010020222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656563131951 (or 656563131943 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21010020222112 its reverse (21122202001012), we get a palindrome (42132222223124).

The spelling of 21010020222112 in words is "twenty-one trillion, ten billion, twenty million, two hundred twenty-two thousand, one hundred twelve".