31300120121 has 4 divisors (see below), whose sum is σ = 31300537572. Its totient is φ = 31299702672.

The previous prime is 31300120087. The next prime is 31300120133. The reversal of 31300120121 is 12102100313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12102100313 = 941 ⋅12860893.

It can be written as a sum of positive squares in 2 ways, for example, as 29656628521 + 1643491600 = 172211^2 + 40540^2 .

It is a cyclic number.

It is not a de Polignac number, because 31300120121 - 2¹⁸ = 31299857977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31300120096 and 31300120105.

It is not an unprimeable number, because it can be changed into a prime (31300120171) 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, 61766 + ... + 257711.

It is an arithmetic number, because the mean of its divisors is an integer number (7825134393).

Almost surely, 2^31300120121 is an apocalyptic number.

It is an amenable number.

31300120121 is a deficient number, since it is larger than the sum of its proper divisors (417451).

31300120121 is an equidigital number, since it uses as much as digits as its factorization.

31300120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417450.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31300120121 its reverse (12102100313), we get a palindrome (43402220434).

The spelling of 31300120121 in words is "thirty-one billion, three hundred million, one hundred twenty thousand, one hundred twenty-one".