10121220121 has 4 divisors (see below), whose sum is σ = 10138462992. Its totient is φ = 10103977252.

The previous prime is 10121220097. The next prime is 10121220133. The reversal of 10121220121 is 12102212101.

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 10121220121 - 2⁷ = 10121219993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10121224121) 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, 8620555 + ... + 8621728.

It is an arithmetic number, because the mean of its divisors is an integer number (2534615748).

Almost surely, 2^10121220121 is an apocalyptic number.

It is an amenable number.

10121220121 is a deficient number, since it is larger than the sum of its proper divisors (17242871).

10121220121 is an equidigital number, since it uses as much as digits as its factorization.

10121220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17242870.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10121220121 its reverse (12102212101), we get a palindrome (22223432222).

The spelling of 10121220121 in words is "ten billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".