31323220032221 has 8 divisors (see below), whose sum is σ = 33762576898680. Its totient is φ = 28888131508992.

The previous prime is 31323220032211. The next prime is 31323220032239. The reversal of 31323220032221 is 12223002232313.

It can be written as a sum of positive squares in 4 ways, for example, as 1240996 + 31323218791225 = 1114^2 + 5596715^2 .

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 31323220032221 - 2⁶ = 31323220032157 is a prime.

It is a super-2 number, since 2×31323220032221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323220032211) 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, 1067070560 + ... + 1067099913.

It is an arithmetic number, because the mean of its divisors is an integer number (4220322112335).

Almost surely, 2^{31323220032221} is an apocalyptic number.

It is an amenable number.

31323220032221 is a deficient number, since it is larger than the sum of its proper divisors (2439356866459).

31323220032221 is a wasteful number, since it uses less digits than its factorization.

31323220032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134171615.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 31323220032221 its reverse (12223002232313), we get a palindrome (43546222264534).

The spelling of 31323220032221 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred twenty million, thirty-two thousand, two hundred twenty-one".