31423440231121 has 4 divisors (see below), whose sum is σ = 31513997696112. Its totient is φ = 31332882766132.

The previous prime is 31423440231107. The next prime is 31423440231191. The reversal of 31423440231121 is 12113204432413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31423440231121 - 2²⁵ = 31423406676689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31423440231191) 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, 45278731975 + ... + 45278732668.

It is an arithmetic number, because the mean of its divisors is an integer number (7878499424028).

Almost surely, 2^{31423440231121} is an apocalyptic number.

It is an amenable number.

31423440231121 is a deficient number, since it is larger than the sum of its proper divisors (90557464991).

31423440231121 is an equidigital number, since it uses as much as digits as its factorization.

31423440231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90557464990.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 31423440231121 its reverse (12113204432413), we get a palindrome (43536644663534).

The spelling of 31423440231121 in words is "thirty-one trillion, four hundred twenty-three billion, four hundred forty million, two hundred thirty-one thousand, one hundred twenty-one".