83121370170401 has 4 divisors (see below), whose sum is σ = 85148720662404. Its totient is φ = 81094019678400.

The previous prime is 83121370170367. The next prime is 83121370170409. The reversal of 83121370170401 is 10407107312138.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1631301146176 + 81490069024225 = 1277224^2 + 9027185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83121370170401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83121370170409) 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, 1013675245940 + ... + 1013675246021.

It is an arithmetic number, because the mean of its divisors is an integer number (21287180165601).

Almost surely, 2^{83121370170401} is an apocalyptic number.

It is an amenable number.

83121370170401 is a deficient number, since it is larger than the sum of its proper divisors (2027350492003).

83121370170401 is a wasteful number, since it uses less digits than its factorization.

83121370170401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027350492002.

The product of its (nonzero) digits is 28224, while the sum is 38.

Adding to 83121370170401 its reverse (10407107312138), we get a palindrome (93528477482539).

The spelling of 83121370170401 in words is "eighty-three trillion, one hundred twenty-one billion, three hundred seventy million, one hundred seventy thousand, four hundred one".