1221346431221 has 8 divisors (see below), whose sum is σ = 1396324631424. Its totient is φ = 1046493265680.

The previous prime is 1221346431199. The next prime is 1221346431281.

1221346431221 is nontrivially palindromic in base 10.

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 1221346431221 - 2¹⁴ = 1221346414837 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 (1221346431281) 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 7 ways as a sum of consecutive naturals, for example, 31237730 + ... + 31276803.

It is an arithmetic number, because the mean of its divisors is an integer number (174540578928).

Almost surely, 2^{1221346431221} is an apocalyptic number.

It is an amenable number.

1221346431221 is a deficient number, since it is larger than the sum of its proper divisors (174978200203).

1221346431221 is an equidigital number, since it uses as much as digits as its factorization.

1221346431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62517331.

The product of its digits is 13824, while the sum is 32.

The spelling of 1221346431221 in words is "one trillion, two hundred twenty-one billion, three hundred forty-six million, four hundred thirty-one thousand, two hundred twenty-one".