1221321333331 has 8 divisors (see below), whose sum is σ = 1332480996864. Its totient is φ = 1110183411720.

The previous prime is 1221321333317. The next prime is 1221321333343. The reversal of 1221321333331 is 1333331231221.

It is a happy number.

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 1221321333331 - 2⁷ = 1221321333203 is a prime.

It is a super-2 number, since 2×1221321333331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221321333331.

It is not an unprimeable number, because it can be changed into a prime (1221321333931) 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, 5317911 + ... + 5542816.

It is an arithmetic number, because the mean of its divisors is an integer number (166560124608).

Almost surely, 2^{1221321333331} is an apocalyptic number.

1221321333331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221321333331 is a deficient number, since it is larger than the sum of its proper divisors (111159663533).

1221321333331 is a wasteful number, since it uses less digits than its factorization.

1221321333331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10870961.

The product of its digits is 5832, while the sum is 28.

Adding to 1221321333331 its reverse (1333331231221), we get a palindrome (2554652564552).

The spelling of 1221321333331 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, three hundred thirty-three thousand, three hundred thirty-one".