31023313011221 has 16 divisors (see below), whose sum is σ = 33307397760000. Its totient is φ = 28809709124976.

The previous prime is 31023313011211. The next prime is 31023313011241. The reversal of 31023313011221 is 12211031332013.

It is a cyclic number.

It is not a de Polignac number, because 31023313011221 - 2⁶ = 31023313011157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023313011211) 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, 74138231 + ... + 74555508.

It is an arithmetic number, because the mean of its divisors is an integer number (2081712360000).

Almost surely, 2^{31023313011221} is an apocalyptic number.

It is an amenable number.

31023313011221 is a deficient number, since it is larger than the sum of its proper divisors (2284084748779).

31023313011221 is a wasteful number, since it uses less digits than its factorization.

31023313011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148693976.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31023313011221 its reverse (12211031332013), we get a palindrome (43234344343234).

The spelling of 31023313011221 in words is "thirty-one trillion, twenty-three billion, three hundred thirteen million, eleven thousand, two hundred twenty-one".