31231123002121 has 32 divisors (see below), whose sum is σ = 36187315799040. Its totient is φ = 26399753924544.

The previous prime is 31231123002113. The next prime is 31231123002133. The reversal of 31231123002121 is 12120032113213.

It is not a de Polignac number, because 31231123002121 - 2³ = 31231123002113 is a prime.

It is a super-2 number, since 2×31231123002121² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31231123002092 and 31231123002101.

It is not an unprimeable number, because it can be changed into a prime (31231123002181) 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, 2416701966 + ... + 2416714888.

It is an arithmetic number, because the mean of its divisors is an integer number (1130853618720).

Almost surely, 2^{31231123002121} is an apocalyptic number.

It is an amenable number.

31231123002121 is a deficient number, since it is larger than the sum of its proper divisors (4956192796919).

31231123002121 is a wasteful number, since it uses less digits than its factorization.

31231123002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20125.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31231123002121 its reverse (12120032113213), we get a palindrome (43351155115334).

The spelling of 31231123002121 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-three million, two thousand, one hundred twenty-one".