1221243541321 has 8 divisors (see below), whose sum is σ = 1294902874080. Its totient is φ = 1148522544288.

The previous prime is 1221243541313. The next prime is 1221243541369. The reversal of 1221243541321 is 1231453421221.

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 1221243541321 - 2³ = 1221243541313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221243541391) 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, 234581251 + ... + 234586456.

It is an arithmetic number, because the mean of its divisors is an integer number (161862859260).

Almost surely, 2^{1221243541321} is an apocalyptic number.

It is an amenable number.

1221243541321 is a deficient number, since it is larger than the sum of its proper divisors (73659332759).

1221243541321 is a wasteful number, since it uses less digits than its factorization.

1221243541321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469167863.

The product of its digits is 11520, while the sum is 31.

Adding to 1221243541321 its reverse (1231453421221), we get a palindrome (2452696962542).

The spelling of 1221243541321 in words is "one trillion, two hundred twenty-one billion, two hundred forty-three million, five hundred forty-one thousand, three hundred twenty-one".