1220123331221 has 8 divisors (see below), whose sum is σ = 1237334133888. Its totient is φ = 1202913250000.

The previous prime is 1220123331181. The next prime is 1220123331283. The reversal of 1220123331221 is 1221333210221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220123331221 - 2²² = 1220119136917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220123331821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3859496 + ... + 4163646.

It is an arithmetic number, because the mean of its divisors is an integer number (154666766736).

Almost surely, 2^{1220123331221} is an apocalyptic number.

It is an amenable number.

1220123331221 is a deficient number, since it is larger than the sum of its proper divisors (17210802667).

1220123331221 is an equidigital number, since it uses as much as digits as its factorization.

1220123331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360723.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1220123331221 its reverse (1221333210221), we get a palindrome (2441456541442).

The spelling of 1220123331221 in words is "one trillion, two hundred twenty billion, one hundred twenty-three million, three hundred thirty-one thousand, two hundred twenty-one".