31321123022221 has 16 divisors (see below), whose sum is σ = 31587362408448. Its totient is φ = 31055196614400.

The previous prime is 31321123022209. The next prime is 31321123022227. The reversal of 31321123022221 is 12222032112313.

It is not a de Polignac number, because 31321123022221 - 2³⁹ = 30771367208333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321123022227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750654686 + ... + 1750672576.

It is an arithmetic number, because the mean of its divisors is an integer number (1974210150528).

Almost surely, 2^{31321123022221} is an apocalyptic number.

It is an amenable number.

31321123022221 is a deficient number, since it is larger than the sum of its proper divisors (266239386227).

31321123022221 is a wasteful number, since it uses less digits than its factorization.

31321123022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25812.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31321123022221 its reverse (12222032112313), we get a palindrome (43543155134534).

The spelling of 31321123022221 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred twenty-three million, twenty-two thousand, two hundred twenty-one".