1221300321128 has 32 divisors (see below), whose sum is σ = 2298522035520. Its totient is φ = 608361936000.

The previous prime is 1221300321127. The next prime is 1221300321173. The reversal of 1221300321128 is 8211230031221.

It is a junction number, because it is equal to n+sod(n) for n = 1221300321097 and 1221300321106.

It is not an unprimeable number, because it can be changed into a prime (1221300321127) 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, 12519983 + ... + 12617153.

It is an arithmetic number, because the mean of its divisors is an integer number (71828813610).

Almost surely, 2^{1221300321128} is an apocalyptic number.

It is an amenable number.

1221300321128 is a deficient number, since it is larger than the sum of its proper divisors (1077221714392).

1221300321128 is a wasteful number, since it uses less digits than its factorization.

1221300321128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103049 (or 103045 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 1221300321128 its reverse (8211230031221), we get a palindrome (9432530352349).

The spelling of 1221300321128 in words is "one trillion, two hundred twenty-one billion, three hundred million, three hundred twenty-one thousand, one hundred twenty-eight".