128551421101 has 8 divisors (see below), whose sum is σ = 128643134400. Its totient is φ = 128459746272.

The previous prime is 128551421081. The next prime is 128551421107. The reversal of 128551421101 is 101124155821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128551421101 - 2²¹ = 128549323949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128551421107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9959550 + ... + 9972448.

It is an arithmetic number, because the mean of its divisors is an integer number (16080391800).

Almost surely, 2^128551421101 is an apocalyptic number.

It is an amenable number.

128551421101 is a deficient number, since it is larger than the sum of its proper divisors (91713299).

128551421101 is a wasteful number, since it uses less digits than its factorization.

128551421101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19235.

The product of its (nonzero) digits is 3200, while the sum is 31.

Adding to 128551421101 its reverse (101124155821), we get a palindrome (229675576922).

The spelling of 128551421101 in words is "one hundred twenty-eight billion, five hundred fifty-one million, four hundred twenty-one thousand, one hundred one".