21102020122202 has 16 divisors (see below), whose sum is σ = 33639564128040. Its totient is φ = 9893446560768.

The previous prime is 21102020122189. The next prime is 21102020122223. The reversal of 21102020122202 is 20222102020112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9718488267601 + 11383531854601 = 3117449^2 + 3373949^2 .

It is a super-2 number, since 2×21102020122202² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 1153611023 + ... + 1153629314.

Almost surely, 2^{21102020122202} is an apocalyptic number.

21102020122202 is a deficient number, since it is larger than the sum of its proper divisors (12537544005838).

21102020122202 is a wasteful number, since it uses less digits than its factorization.

21102020122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307240625.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21102020122202 its reverse (20222102020112), we get a palindrome (41324122142314).

The spelling of 21102020122202 in words is "twenty-one trillion, one hundred two billion, twenty million, one hundred twenty-two thousand, two hundred two".