128621100427 has 2 divisors, whose sum is σ = 128621100428. Its totient is φ = 128621100426.

The previous prime is 128621100407. The next prime is 128621100449. The reversal of 128621100427 is 724001126821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128621100427 - 2⁷ = 128621100299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128621100392 and 128621100401.

It is not a weakly prime, because it can be changed into another prime (128621100407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64310550213 + 64310550214.

It is an arithmetic number, because the mean of its divisors is an integer number (64310550214).

Almost surely, 2^128621100427 is an apocalyptic number.

128621100427 is a deficient number, since it is larger than the sum of its proper divisors (1).

128621100427 is an equidigital number, since it uses as much as digits as its factorization.

128621100427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 128621100427 in words is "one hundred twenty-eight billion, six hundred twenty-one million, one hundred thousand, four hundred twenty-seven".