128421014820111 has 12 divisors (see below), whose sum is σ = 199766023053688. Its totient is φ = 79028316812304.

The previous prime is 128421014820089. The next prime is 128421014820151. The reversal of 128421014820111 is 111028410124821.

128421014820111 is a `hidden beast` number, since 1 + 2 + 8 + 421 + 0 + 14 + 8 + 201 + 11 = 666.

It is not a de Polignac number, because 128421014820111 - 2⁶ = 128421014820047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128421014820151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 548807755525 + ... + 548807755758.

Almost surely, 2^{128421014820111} is an apocalyptic number.

128421014820111 is a deficient number, since it is larger than the sum of its proper divisors (71345008233577).

128421014820111 is a wasteful number, since it uses less digits than its factorization.

128421014820111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097615511302 (or 1097615511299 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

Adding to 128421014820111 its reverse (111028410124821), we get a palindrome (239449424944932).

The spelling of 128421014820111 in words is "one hundred twenty-eight trillion, four hundred twenty-one billion, fourteen million, eight hundred twenty thousand, one hundred eleven".