231010020213121 has 4 divisors (see below), whose sum is σ = 231010080178500. Its totient is φ = 231009960247744.

The previous prime is 231010020213103. The next prime is 231010020213127. The reversal of 231010020213121 is 121312020010132.

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 114994739073600 + 116015281139521 = 10723560^2 + 10771039^2 .

It is a cyclic number.

It is not a de Polignac number, because 231010020213121 - 2²³ = 231010011824513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231010020213127) 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 3 ways as a sum of consecutive naturals, for example, 23775796 + ... + 32051653.

It is an arithmetic number, because the mean of its divisors is an integer number (57752520044625).

Almost surely, 2^{231010020213121} is an apocalyptic number.

It is an amenable number.

231010020213121 is a deficient number, since it is larger than the sum of its proper divisors (59965379).

231010020213121 is an equidigital number, since it uses as much as digits as its factorization.

231010020213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59965378.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 231010020213121 its reverse (121312020010132), we get a palindrome (352322040223253).

The spelling of 231010020213121 in words is "two hundred thirty-one trillion, ten billion, twenty million, two hundred thirteen thousand, one hundred twenty-one".