21002122200122 has 48 divisors (see below), whose sum is σ = 38743778484000. Its totient is φ = 8489940679584.

The previous prime is 21002122200107. The next prime is 21002122200211. The reversal of 21002122200122 is 22100222120012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002122200122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24200972 + ... + 25053767.

It is an arithmetic number, because the mean of its divisors is an integer number (807162051750).

Almost surely, 2^{21002122200122} is an apocalyptic number.

21002122200122 is a deficient number, since it is larger than the sum of its proper divisors (17741656283878).

21002122200122 is a wasteful number, since it uses less digits than its factorization.

21002122200122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49255003 (or 49254996 counting only the distinct ones).

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

Adding to 21002122200122 its reverse (22100222120012), we get a palindrome (43102344320134).

The spelling of 21002122200122 in words is "twenty-one trillion, two billion, one hundred twenty-two million, two hundred thousand, one hundred twenty-two".