121220011219 has 4 divisors (see below), whose sum is σ = 123507181296. Its totient is φ = 118932841144.

The previous prime is 121220011217. The next prime is 121220011259. The reversal of 121220011219 is 912110022121.

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

It is a cyclic number.

It is not a de Polignac number, because 121220011219 - 2¹ = 121220011217 is a prime.

It is a super-2 number, since 2×121220011219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220011219.

It is not an unprimeable number, because it can be changed into a prime (121220011217) 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, 1143584959 + ... + 1143585064.

It is an arithmetic number, because the mean of its divisors is an integer number (30876795324).

Almost surely, 2^121220011219 is an apocalyptic number.

121220011219 is a deficient number, since it is larger than the sum of its proper divisors (2287170077).

121220011219 is an equidigital number, since it uses as much as digits as its factorization.

121220011219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287170076.

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

The spelling of 121220011219 in words is "one hundred twenty-one billion, two hundred twenty million, eleven thousand, two hundred nineteen".