10122111121 has 4 divisors (see below), whose sum is σ = 10165553892. Its totient is φ = 10078668352.

The previous prime is 10122111107. The next prime is 10122111133. The reversal of 10122111121 is 12111122101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1278777600 + 8843333521 = 35760^2 + 94039^2 .

It is a cyclic number.

It is not a de Polignac number, because 10122111121 - 2²⁵ = 10088556689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10122111221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21721036 + ... + 21721501.

It is an arithmetic number, because the mean of its divisors is an integer number (2541388473).

Almost surely, 2^10122111121 is an apocalyptic number.

It is an amenable number.

10122111121 is a deficient number, since it is larger than the sum of its proper divisors (43442771).

10122111121 is an equidigital number, since it uses as much as digits as its factorization.

10122111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43442770.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10122111121 its reverse (12111122101), we get a palindrome (22233233222).

The spelling of 10122111121 in words is "ten billion, one hundred twenty-two million, one hundred eleven thousand, one hundred twenty-one".