121221211219 has 4 divisors (see below), whose sum is σ = 121558875120. Its totient is φ = 120883547320.

The previous prime is 121221211159. The next prime is 121221211249. The reversal of 121221211219 is 912112122121.

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 121221211219 - 2⁷ = 121221211091 is a prime.

It is a super-2 number, since 2×121221211219² (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 = 121221211193 and 121221211202.

It is not an unprimeable number, because it can be changed into a prime (121221211249) 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, 168831412 + ... + 168832129.

It is an arithmetic number, because the mean of its divisors is an integer number (30389718780).

Almost surely, 2^121221211219 is an apocalyptic number.

121221211219 is a deficient number, since it is larger than the sum of its proper divisors (337663901).

121221211219 is an equidigital number, since it uses as much as digits as its factorization.

121221211219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337663900.

The product of its digits is 288, while the sum is 25.

The spelling of 121221211219 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred nineteen".