21120220002122 has 32 divisors (see below), whose sum is σ = 32393669394240. Its totient is φ = 10325513802240.

The previous prime is 21120220002103. The next prime is 21120220002149. The reversal of 21120220002122 is 22120002202112.

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 21120220002122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5898497 + ... + 8776827.

It is an arithmetic number, because the mean of its divisors is an integer number (1012302168570).

Almost surely, 2^{21120220002122} is an apocalyptic number.

21120220002122 is a deficient number, since it is larger than the sum of its proper divisors (11273449392118).

21120220002122 is a wasteful number, since it uses less digits than its factorization.

21120220002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878886.

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

Adding to 21120220002122 its reverse (22120002202112), we get a palindrome (43240222204234).

The spelling of 21120220002122 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, two thousand, one hundred twenty-two".