121220112121 has 4 divisors (see below), whose sum is σ = 122754544000. Its totient is φ = 119685680244.

The previous prime is 121220112109. The next prime is 121220112151. The reversal of 121220112121 is 121211022121.

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 121220112121 - 2¹³ = 121220103929 is a prime.

It is a super-2 number, since 2×121220112121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220112095 and 121220112104.

It is not an unprimeable number, because it can be changed into a prime (121220112151) 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 3 ways as a sum of consecutive naturals, for example, 767215821 + ... + 767215978.

It is an arithmetic number, because the mean of its divisors is an integer number (30688636000).

Almost surely, 2^121220112121 is an apocalyptic number.

It is an amenable number.

121220112121 is a deficient number, since it is larger than the sum of its proper divisors (1534431879).

121220112121 is an equidigital number, since it uses as much as digits as its factorization.

121220112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534431878.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121220112121 its reverse (121211022121), we get a palindrome (242431134242).

The spelling of 121220112121 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".