128320121215802 has 8 divisors (see below), whose sum is σ = 192480612676212. Its totient is φ = 64159916990400.

The previous prime is 128320121215801. The next prime is 128320121215823. The reversal of 128320121215802 is 208512121023821.

It can be written as a sum of positive squares in 2 ways, for example, as 115569358601761 + 12750762614041 = 10750319^2 + 3570821^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (128320121215801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70688399 + ... + 72480962.

Almost surely, 2^{128320121215802} is an apocalyptic number.

128320121215802 is a deficient number, since it is larger than the sum of its proper divisors (64160491460410).

128320121215802 is a wasteful number, since it uses less digits than its factorization.

128320121215802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143617504.

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 128320121215802 in words is "one hundred twenty-eight trillion, three hundred twenty billion, one hundred twenty-one million, two hundred fifteen thousand, eight hundred two".