128107462335821 has 4 divisors (see below), whose sum is σ = 128110222664544. Its totient is φ = 128104702007100.

The previous prime is 128107462335793. The next prime is 128107462335841. The reversal of 128107462335821 is 128533264701821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128107462335821 - 2⁴² = 123709415824717 is a prime.

It is a super-2 number, since 2×128107462335821² (a number of 29 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 (128107462335841) 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, 1380094745 + ... + 1380187566.

It is an arithmetic number, because the mean of its divisors is an integer number (32027555666136).

Almost surely, 2^{128107462335821} is an apocalyptic number.

It is an amenable number.

128107462335821 is a deficient number, since it is larger than the sum of its proper divisors (2760328723).

128107462335821 is an equidigital number, since it uses as much as digits as its factorization.

128107462335821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760328722.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 128107462335821 in words is "one hundred twenty-eight trillion, one hundred seven billion, four hundred sixty-two million, three hundred thirty-five thousand, eight hundred twenty-one".