31023021002221 has 12 divisors (see below), whose sum is σ = 31934523526848. Its totient is φ = 30123877590072.

The previous prime is 31023021002201. The next prime is 31023021002263. The reversal of 31023021002221 is 12220012032013.

It is not a de Polignac number, because 31023021002221 - 2¹¹ = 31023021000173 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 (31023021002201) 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, 19703971 + ... + 21220096.

It is an arithmetic number, because the mean of its divisors is an integer number (2661210293904).

Almost surely, 2^{31023021002221} is an apocalyptic number.

It is an amenable number.

31023021002221 is a deficient number, since it is larger than the sum of its proper divisors (911502524627).

31023021002221 is an equidigital number, since it uses as much as digits as its factorization.

31023021002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40924368 (or 40924241 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31023021002221 its reverse (12220012032013), we get a palindrome (43243033034234).

The spelling of 31023021002221 in words is "thirty-one trillion, twenty-three billion, twenty-one million, two thousand, two hundred twenty-one".