10121112121 has 4 divisors (see below), whose sum is σ = 10127365200. Its totient is φ = 10114859044.

The previous prime is 10121112103. The next prime is 10121112137. The reversal of 10121112121 is 12121112101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10121112121 - 2²⁹ = 9584241209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10121112161) 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, 3124111 + ... + 3127348.

It is an arithmetic number, because the mean of its divisors is an integer number (2531841300).

Almost surely, 2^10121112121 is an apocalyptic number.

It is an amenable number.

10121112121 is a deficient number, since it is larger than the sum of its proper divisors (6253079).

10121112121 is an equidigital number, since it uses as much as digits as its factorization.

10121112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6253078.

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

Adding to 10121112121 its reverse (12121112101), we get a palindrome (22242224222).

The spelling of 10121112121 in words is "ten billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".