231321201121 has 16 divisors (see below), whose sum is σ = 257563405440. Its totient is φ = 206746784640.

The previous prime is 231321201119. The next prime is 231321201191. The reversal of 231321201121 is 121102123132.

It is a cyclic number.

It is not a de Polignac number, because 231321201121 - 2¹ = 231321201119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231321201191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3593710 + ... + 3657511.

It is an arithmetic number, because the mean of its divisors is an integer number (16097712840).

Almost surely, 2^231321201121 is an apocalyptic number.

It is an amenable number.

231321201121 is a deficient number, since it is larger than the sum of its proper divisors (26242204319).

231321201121 is a wasteful number, since it uses less digits than its factorization.

231321201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251336.

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

Adding to 231321201121 its reverse (121102123132), we get a palindrome (352423324253).

The spelling of 231321201121 in words is "two hundred thirty-one billion, three hundred twenty-one million, two hundred one thousand, one hundred twenty-one".