1221331211330 has 128 divisors (see below), whose sum is σ = 2395343301120. Its totient is φ = 446832322560.

The previous prime is 1221331211323. The next prime is 1221331211339. The reversal of 1221331211330 is 331121331221.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221331211296 and 1221331211305.

It is not an unprimeable number, because it can be changed into a prime (1221331211339) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 321654992 + ... + 321658788.

It is an arithmetic number, because the mean of its divisors is an integer number (18713619540).

Almost surely, 2^{1221331211330} is an apocalyptic number.

1221331211330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221331211330 is a deficient number, since it is larger than the sum of its proper divisors (1174012089790).

1221331211330 is a wasteful number, since it uses less digits than its factorization.

1221331211330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1221331211330 its reverse (331121331221), we get a palindrome (1552452542551).

The spelling of 1221331211330 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, three hundred thirty".