31131302322121 has 16 divisors (see below), whose sum is σ = 31244607995904. Its totient is φ = 31018181080384.

The previous prime is 31131302322077. The next prime is 31131302322137. The reversal of 31131302322121 is 12122320313113.

It is a cyclic number.

It is not a de Polignac number, because 31131302322121 - 2¹³ = 31131302313929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131306322121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1645669155 + ... + 1645688071.

It is an arithmetic number, because the mean of its divisors is an integer number (1952787999744).

Almost surely, 2^{31131302322121} is an apocalyptic number.

It is an amenable number.

31131302322121 is a deficient number, since it is larger than the sum of its proper divisors (113305673783).

31131302322121 is a wasteful number, since it uses less digits than its factorization.

31131302322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23480.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31131302322121 its reverse (12122320313113), we get a palindrome (43253622635234).

The spelling of 31131302322121 in words is "thirty-one trillion, one hundred thirty-one billion, three hundred two million, three hundred twenty-two thousand, one hundred twenty-one".