1213220421019 has 4 divisors (see below), whose sum is σ = 1213264264680. Its totient is φ = 1213176577360.

The previous prime is 1213220420987. The next prime is 1213220421029. The reversal of 1213220421019 is 9101240223121.

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 1213220421019 - 2⁵ = 1213220420987 is a prime.

It is a super-2 number, since 2×1213220421019² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213220421029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21880297 + ... + 21935674.

It is an arithmetic number, because the mean of its divisors is an integer number (303316066170).

Almost surely, 2^{1213220421019} is an apocalyptic number.

1213220421019 is a deficient number, since it is larger than the sum of its proper divisors (43843661).

1213220421019 is an equidigital number, since it uses as much as digits as its factorization.

1213220421019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43843660.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 1213220421019 in words is "one trillion, two hundred thirteen billion, two hundred twenty million, four hundred twenty-one thousand, nineteen".