31443231101221 has 4 divisors (see below), whose sum is σ = 31443411661344. Its totient is φ = 31443050541100.

The previous prime is 31443231101207. The next prime is 31443231101237. The reversal of 31443231101221 is 12210113234413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31443231101221 - 2¹¹ = 31443231099173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31443231101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31443231101521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90018595 + ... + 90367216.

It is an arithmetic number, because the mean of its divisors is an integer number (7860852915336).

Almost surely, 2^{31443231101221} is an apocalyptic number.

It is an amenable number.

31443231101221 is a deficient number, since it is larger than the sum of its proper divisors (180560123).

31443231101221 is a wasteful number, since it uses less digits than its factorization.

31443231101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180560122.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 31443231101221 its reverse (12210113234413), we get a palindrome (43653344335634).

The spelling of 31443231101221 in words is "thirty-one trillion, four hundred forty-three billion, two hundred thirty-one million, one hundred one thousand, two hundred twenty-one".