1221310012219 has 4 divisors (see below), whose sum is σ = 1332338195160. Its totient is φ = 1110281829280.

The previous prime is 1221310012183. The next prime is 1221310012231. The reversal of 1221310012219 is 9122100131221.

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 1221310012219 - 2²⁹ = 1220773141307 is a prime.

It is a super-2 number, since 2×1221310012219² (a number of 25 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 = 1221310012193 and 1221310012202.

It is not an unprimeable number, because it can be changed into a prime (1221310012319) 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, 55514091454 + ... + 55514091475.

It is an arithmetic number, because the mean of its divisors is an integer number (333084548790).

Almost surely, 2^{1221310012219} is an apocalyptic number.

1221310012219 is a deficient number, since it is larger than the sum of its proper divisors (111028182941).

1221310012219 is a wasteful number, since it uses less digits than its factorization.

1221310012219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111028182940.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 1221310012219 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, twelve thousand, two hundred nineteen".