31330311212221 has 16 divisors (see below), whose sum is σ = 35919663033600. Its totient is φ = 26769360683520.

The previous prime is 31330311212197. The next prime is 31330311212227. The reversal of 31330311212221 is 12221211303313.

It is not a de Polignac number, because 31330311212221 - 2⁷ = 31330311212093 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 (31330311212227) 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, 187308736 + ... + 187475926.

It is an arithmetic number, because the mean of its divisors is an integer number (2244978939600).

Almost surely, 2^{31330311212221} is an apocalyptic number.

It is an amenable number.

31330311212221 is a deficient number, since it is larger than the sum of its proper divisors (4589351821379).

31330311212221 is a wasteful number, since it uses less digits than its factorization.

31330311212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251964.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31330311212221 its reverse (12221211303313), we get a palindrome (43551522515534).

The spelling of 31330311212221 in words is "thirty-one trillion, three hundred thirty billion, three hundred eleven million, two hundred twelve thousand, two hundred twenty-one".