121220211019 has 4 divisors (see below), whose sum is σ = 121221839520. Its totient is φ = 121218582520.

The previous prime is 121220211017. The next prime is 121220211043. The reversal of 121220211019 is 910112022121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910112022121 = 25469 ⋅35734109.

It is a cyclic number.

It is not a de Polignac number, because 121220211019 - 2¹ = 121220211017 is a prime.

It is a super-2 number, since 2×121220211019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220211017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696964 + ... + 853345.

It is an arithmetic number, because the mean of its divisors is an integer number (30305459880).

Almost surely, 2^121220211019 is an apocalyptic number.

121220211019 is a deficient number, since it is larger than the sum of its proper divisors (1628501).

121220211019 is an equidigital number, since it uses as much as digits as its factorization.

121220211019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628500.

The product of its (nonzero) digits is 144, while the sum is 22.

It can be divided in two parts, 1212202 and 11019, that added together give a palindrome (1223221).

The spelling of 121220211019 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, nineteen".