31100202132221 has 2 divisors, whose sum is σ = 31100202132222. Its totient is φ = 31100202132220.

The previous prime is 31100202132217. The next prime is 31100202132227. The reversal of 31100202132221 is 12223120200113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16255903123321 + 14844299008900 = 4031861^2 + 3852830^2 .

It is a cyclic number.

It is not a de Polignac number, because 31100202132221 - 2² = 31100202132217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31100202132193 and 31100202132202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31100202132227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15550101066110 + 15550101066111.

It is an arithmetic number, because the mean of its divisors is an integer number (15550101066111).

Almost surely, 2^{31100202132221} is an apocalyptic number.

It is an amenable number.

31100202132221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31100202132221 is an equidigital number, since it uses as much as digits as its factorization.

31100202132221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31100202132221 its reverse (12223120200113), we get a palindrome (43323322332334).

The spelling of 31100202132221 in words is "thirty-one trillion, one hundred billion, two hundred two million, one hundred thirty-two thousand, two hundred twenty-one".