31212130100321 has 2 divisors, whose sum is σ = 31212130100322. Its totient is φ = 31212130100320.

The previous prime is 31212130100297. The next prime is 31212130100351. The reversal of 31212130100321 is 12300103121213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27025649904400 + 4186480195921 = 5198620^2 + 2046089^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212130100321 - 2⁴² = 26814083589217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212130100293 and 31212130100302.

It is not a weakly prime, because it can be changed into another prime (31212130100351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606065050160 + 15606065050161.

It is an arithmetic number, because the mean of its divisors is an integer number (15606065050161).

Almost surely, 2^{31212130100321} is an apocalyptic number.

It is an amenable number.

31212130100321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212130100321 is an equidigital number, since it uses as much as digits as its factorization.

31212130100321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31212130100321 its reverse (12300103121213), we get a palindrome (43512233221534).

The spelling of 31212130100321 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirty million, one hundred thousand, three hundred twenty-one".