1221338488608 has 72 divisors (see below), whose sum is σ = 3969350094528. Its totient is φ = 348953853312.

The previous prime is 1221338488603. The next prime is 1221338488633. The reversal of 1221338488608 is 8068848331221.

1221338488608 is a `hidden beast` number, since 1 + 2 + 21 + 3 + 3 + 8 + 4 + 8 + 8 + 608 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (1221338488603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302909316 + ... + 302913347.

It is an arithmetic number, because the mean of its divisors is an integer number (55129862424).

Almost surely, 2^{1221338488608} is an apocalyptic number.

1221338488608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1221338488608 is an abundant number, since it is smaller than the sum of its proper divisors (2748011605920).

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

1221338488608 is a wasteful number, since it uses less digits than its factorization.

1221338488608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605822686 (or 605822675 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 1221338488608 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-eight million, four hundred eighty-eight thousand, six hundred eight".