31322021121 has 12 divisors (see below), whose sum is σ = 45690870420. Its totient is φ = 20674600800.

The previous prime is 31322021119. The next prime is 31322021141. The reversal of 31322021121 is 12112022313.

It can be written as a sum of positive squares in 2 ways, for example, as 27335992896 + 3986028225 = 165336^2 + 63135^2 .

It is not a de Polignac number, because 31322021121 - 2¹ = 31322021119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31322021094 and 31322021103.

It is not an unprimeable number, because it can be changed into a prime (31322021141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17227926 + ... + 17229743.

It is an arithmetic number, because the mean of its divisors is an integer number (3807572535).

Almost surely, 2^31322021121 is an apocalyptic number.

It is an amenable number.

31322021121 is a deficient number, since it is larger than the sum of its proper divisors (14368849299).

31322021121 is a wasteful number, since it uses less digits than its factorization.

31322021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34457776 (or 34457773 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31322021121 its reverse (12112022313), we get a palindrome (43434043434).

The spelling of 31322021121 in words is "thirty-one billion, three hundred twenty-two million, twenty-one thousand, one hundred twenty-one".