1221331023330 has 64 divisors (see below), whose sum is σ = 3198493961856. Its totient is φ = 296003648000.

The previous prime is 1221331023313. The next prime is 1221331023371. The reversal of 1221331023330 is 333201331221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221331023330.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 803920 + ... + 1757540.

It is an arithmetic number, because the mean of its divisors is an integer number (49976468154).

Almost surely, 2^{1221331023330} is an apocalyptic number.

1221331023330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221331023330 is an abundant number, since it is smaller than the sum of its proper divisors (1977162938526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221331023330 is a wasteful number, since it uses less digits than its factorization.

1221331023330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957523.

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 1221331023330 its reverse (333201331221), we get a palindrome (1554532354551).

The spelling of 1221331023330 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, twenty-three thousand, three hundred thirty".