31540341032221 has 6 divisors (see below), whose sum is σ = 36689784466110. Its totient is φ = 27034578027576.

The previous prime is 31540341032219. The next prime is 31540341032237. The reversal of 31540341032221 is 12223014304513.

It can be written as a sum of positive squares in only one way, i.e., 22127747712196 + 9412593320025 = 4704014^2 + 3067995^2 .

It is not a de Polignac number, because 31540341032221 - 2¹ = 31540341032219 is a prime.

It is a super-2 number, since 2×31540341032221² (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 (31540341032201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 321840214566 + ... + 321840214663.

It is an arithmetic number, because the mean of its divisors is an integer number (6114964077685).

Almost surely, 2^{31540341032221} is an apocalyptic number.

It is an amenable number.

31540341032221 is a deficient number, since it is larger than the sum of its proper divisors (5149443433889).

31540341032221 is an equidigital number, since it uses as much as digits as its factorization.

31540341032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643680429243 (or 643680429236 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 31540341032221 its reverse (12223014304513), we get a palindrome (43763355336734).

The spelling of 31540341032221 in words is "thirty-one trillion, five hundred forty billion, three hundred forty-one million, thirty-two thousand, two hundred twenty-one".