31431113200121 has 4 divisors (see below), whose sum is σ = 31433507599872. Its totient is φ = 31428718800372.

The previous prime is 31431113200117. The next prime is 31431113200129. The reversal of 31431113200121 is 12100231113413.

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 31431113200121 - 2² = 31431113200117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31431113200129) 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, 1197180185 + ... + 1197206438.

It is an arithmetic number, because the mean of its divisors is an integer number (7858376899968).

Almost surely, 2^{31431113200121} is an apocalyptic number.

It is an amenable number.

31431113200121 is a deficient number, since it is larger than the sum of its proper divisors (2394399751).

31431113200121 is a wasteful number, since it uses less digits than its factorization.

31431113200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394399750.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31431113200121 its reverse (12100231113413), we get a palindrome (43531344313534).

The spelling of 31431113200121 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred thirteen million, two hundred thousand, one hundred twenty-one".