21211000000122 has 16 divisors (see below), whose sum is σ = 42898651686720. Its totient is φ = 6990891385632.

The previous prime is 21211000000111. The next prime is 21211000000129. The reversal of 21211000000122 is 22100000011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211000000098 and 21211000000107.

It is not an unprimeable number, because it can be changed into a prime (21211000000129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19860486358 + ... + 19860487425.

It is an arithmetic number, because the mean of its divisors is an integer number (2681165730420).

Almost surely, 2^{21211000000122} is an apocalyptic number.

21211000000122 is an abundant number, since it is smaller than the sum of its proper divisors (21687651686598).

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

21211000000122 is a wasteful number, since it uses less digits than its factorization.

21211000000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39720973877.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21211000000122 its reverse (22100000011212), we get a palindrome (43311000011334).

The spelling of 21211000000122 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two", and thus it is an aban number.