31213131330221 has 8 divisors (see below), whose sum is σ = 31573732478400. Its totient is φ = 30852750000160.

The previous prime is 31213131330197. The next prime is 31213131330287. The reversal of 31213131330221 is 12203313131213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31213131330221 - 2²⁶ = 31213064221357 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 (31213131336221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54668891 + ... + 55236888.

It is an arithmetic number, because the mean of its divisors is an integer number (3946716559800).

Almost surely, 2^{31213131330221} is an apocalyptic number.

It is an amenable number.

31213131330221 is a deficient number, since it is larger than the sum of its proper divisors (360601148179).

31213131330221 is a wasteful number, since it uses less digits than its factorization.

31213131330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109909059.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31213131330221 its reverse (12203313131213), we get a palindrome (43416444461434).

The spelling of 31213131330221 in words is "thirty-one trillion, two hundred thirteen billion, one hundred thirty-one million, three hundred thirty thousand, two hundred twenty-one".