128897798821 has 8 divisors (see below), whose sum is σ = 141219284544. Its totient is φ = 116676897120.

The previous prime is 128897798801. The next prime is 128897798831.

128897798821 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 128897798821 - 2⁵ = 128897798789 is a prime.

It is a super-2 number, since 2×128897798821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128897798801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25143321 + ... + 25148446.

It is an arithmetic number, because the mean of its divisors is an integer number (17652410568).

Almost surely, 2^128897798821 is an apocalyptic number.

128897798821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128897798821 is a deficient number, since it is larger than the sum of its proper divisors (12321485723).

128897798821 is a wasteful number, since it uses less digits than its factorization.

128897798821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50292011.

The product of its digits is 65028096, while the sum is 70.

The spelling of 128897798821 in words is "one hundred twenty-eight billion, eight hundred ninety-seven million, seven hundred ninety-eight thousand, eight hundred twenty-one".