31321202123213 has 2 divisors, whose sum is σ = 31321202123214. Its totient is φ = 31321202123212.

The previous prime is 31321202123209. The next prime is 31321202123273. The reversal of 31321202123213 is 31232120212313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31310716977604 + 10485145609 = 5595598^2 + 102397^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321202123213 - 2² = 31321202123209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321202123273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660601061606 + 15660601061607.

It is an arithmetic number, because the mean of its divisors is an integer number (15660601061607).

Almost surely, 2^{31321202123213} is an apocalyptic number.

It is an amenable number.

31321202123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321202123213 is an equidigital number, since it uses as much as digits as its factorization.

31321202123213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31321202123213 its reverse (31232120212313), we get a palindrome (62553322335526).

The spelling of 31321202123213 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred two million, one hundred twenty-three thousand, two hundred thirteen".