128790097821 has 32 divisors (see below), whose sum is σ = 237880704000. Its totient is φ = 66903945840.

The previous prime is 128790097817. The next prime is 128790097829.

128790097821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 128790097821 - 2² = 128790097817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128790097829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30971971 + ... + 30976128.

It is an arithmetic number, because the mean of its divisors is an integer number (7433772000).

Almost surely, 2^128790097821 is an apocalyptic number.

128790097821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128790097821 is a deficient number, since it is larger than the sum of its proper divisors (109090606179).

128790097821 is a wasteful number, since it uses less digits than its factorization.

128790097821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61948126 (or 61948120 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 128790097821 in words is "one hundred twenty-eight billion, seven hundred ninety million, ninety-seven thousand, eight hundred twenty-one".