21200021122122 has 32 divisors (see below), whose sum is σ = 47151049095360. Its totient is φ = 7060690050480.

The previous prime is 21200021122109. The next prime is 21200021122157. The reversal of 21200021122122 is 22122112000212.

It is a happy number.

21200021122122 is a `hidden beast` number, since 212 + 0 + 0 + 0 + 211 + 221 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21200021122095 and 21200021122104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166148328 + ... + 166275875.

It is an arithmetic number, because the mean of its divisors is an integer number (1473470284230).

Almost surely, 2^{21200021122122} is an apocalyptic number.

21200021122122 is an abundant number, since it is smaller than the sum of its proper divisors (25951027973238).

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

21200021122122 is a wasteful number, since it uses less digits than its factorization.

21200021122122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332425395 (or 332425389 counting only the distinct ones).

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

Adding to 21200021122122 its reverse (22122112000212), we get a palindrome (43322133122334).

The spelling of 21200021122122 in words is "twenty-one trillion, two hundred billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-two".