21120122122121 has 48 divisors (see below), whose sum is σ = 23882297592960. Its totient is φ = 18520891200000.

The previous prime is 21120122122117. The next prime is 21120122122157. The reversal of 21120122122121 is 12122122102112.

It is not a de Polignac number, because 21120122122121 - 2² = 21120122122117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120122122093 and 21120122122102.

It is not an unprimeable number, because it can be changed into a prime (21120122122111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 823737020 + ... + 823762658.

It is an arithmetic number, because the mean of its divisors is an integer number (497547866520).

Almost surely, 2^{21120122122121} is an apocalyptic number.

It is an amenable number.

21120122122121 is a deficient number, since it is larger than the sum of its proper divisors (2762175470839).

21120122122121 is a wasteful number, since it uses less digits than its factorization.

21120122122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26238 (or 26195 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21120122122121 its reverse (12122122102112), we get a palindrome (33242244224233).

It can be divided in two parts, 211201 and 22122121, that added together give a palindrome (22333322).

The spelling of 21120122122121 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".