1220221213213 has 4 divisors (see below), whose sum is σ = 1220322312288. Its totient is φ = 1220120114140.

The previous prime is 1220221213103. The next prime is 1220221213249. The reversal of 1220221213213 is 3123121220221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220221213213 - 2¹⁷ = 1220221082141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221219213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50531431 + ... + 50555572.

It is an arithmetic number, because the mean of its divisors is an integer number (305080578072).

Almost surely, 2^{1220221213213} is an apocalyptic number.

It is an amenable number.

1220221213213 is a deficient number, since it is larger than the sum of its proper divisors (101099075).

1220221213213 is a wasteful number, since it uses less digits than its factorization.

1220221213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101099074.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1220221213213 its reverse (3123121220221), we get a palindrome (4343342433434).

The spelling of 1220221213213 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred thirteen thousand, two hundred thirteen".