21121000122 has 16 divisors (see below), whose sum is σ = 42379600032. Its totient is φ = 7017400080.

The previous prime is 21121000081. The next prime is 21121000129. The reversal of 21121000122 is 22100012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121000098 and 21121000107.

It is not an unprimeable number, because it can be changed into a prime (21121000129) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5731329 + ... + 5735012.

It is an arithmetic number, because the mean of its divisors is an integer number (2648725002).

Almost surely, 2^21121000122 is an apocalyptic number.

21121000122 is an abundant number, since it is smaller than the sum of its proper divisors (21258599910).

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

21121000122 is a wasteful number, since it uses less digits than its factorization.

21121000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11466653.

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

Adding to 21121000122 its reverse (22100012112), we get a palindrome (43221012234).

The spelling of 21121000122 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two", and thus it is an aban number.