12128735401 has 4 divisors (see below), whose sum is σ = 12209058304. Its totient is φ = 12048412500.

The previous prime is 12128735387. The next prime is 12128735407. The reversal of 12128735401 is 10453782121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10453782121 = 19 ⋅550199059.

It is a cyclic number.

It is not a de Polignac number, because 12128735401 - 2⁹ = 12128734889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12128735407) 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, 40161225 + ... + 40161526.

It is an arithmetic number, because the mean of its divisors is an integer number (3052264576).

Almost surely, 2^12128735401 is an apocalyptic number.

It is an amenable number.

12128735401 is a deficient number, since it is larger than the sum of its proper divisors (80322903).

12128735401 is an equidigital number, since it uses as much as digits as its factorization.

12128735401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80322902.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 12128735401 in words is "twelve billion, one hundred twenty-eight million, seven hundred thirty-five thousand, four hundred one".