1221321030008 has 64 divisors (see below), whose sum is σ = 2331104832000. Its totient is φ = 599762298240.

The previous prime is 1221321029987. The next prime is 1221321030049. The reversal of 1221321030008 is 8000301231221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 270980891 + ... + 270985397.

It is an arithmetic number, because the mean of its divisors is an integer number (36423513000).

Almost surely, 2^{1221321030008} is an apocalyptic number.

It is an amenable number.

1221321030008 is a deficient number, since it is larger than the sum of its proper divisors (1109783801992).

1221321030008 is a wasteful number, since it uses less digits than its factorization.

1221321030008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6300 (or 6296 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1221321030008 its reverse (8000301231221), we get a palindrome (9221622261229).

The spelling of 1221321030008 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, thirty thousand, eight".