31213103303121 has 32 divisors (see below), whose sum is σ = 42558474053760. Its totient is φ = 20344035976704.

The previous prime is 31213103303119. The next prime is 31213103303141. The reversal of 31213103303121 is 12130330131213.

It is not a de Polignac number, because 31213103303121 - 2¹ = 31213103303119 is a prime.

It is a super-2 number, since 2×31213103303121² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31213103303091 and 31213103303100.

It is not an unprimeable number, because it can be changed into a prime (31213103303141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10013391 + ... + 12755163.

It is an arithmetic number, because the mean of its divisors is an integer number (1329952314180).

Almost surely, 2^{31213103303121} is an apocalyptic number.

It is an amenable number.

31213103303121 is a deficient number, since it is larger than the sum of its proper divisors (11345370750639).

31213103303121 is a wasteful number, since it uses less digits than its factorization.

31213103303121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742305.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 31213103303121 its reverse (12130330131213), we get a palindrome (43343433434334).

The spelling of 31213103303121 in words is "thirty-one trillion, two hundred thirteen billion, one hundred three million, three hundred three thousand, one hundred twenty-one".