2312906821 has 2 divisors, whose sum is σ = 2312906822. Its totient is φ = 2312906820.

The previous prime is 2312906723. The next prime is 2312906851. The reversal of 2312906821 is 1286092132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2249130625 + 63776196 = 47425^2 + 7986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312906821 - 2¹³ = 2312898629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2312906851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156453410 + 1156453411.

It is an arithmetic number, because the mean of its divisors is an integer number (1156453411).

Almost surely, 2^2312906821 is an apocalyptic number.

It is an amenable number.

2312906821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2312906821 is an equidigital number, since it uses as much as digits as its factorization.

2312906821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 2312906821 is about 48092.6898915001. The cubic root of 2312906821 is about 1322.4706599028.

Adding to 2312906821 its reverse (1286092132), we get a palindrome (3598998953).

The spelling of 2312906821 in words is "two billion, three hundred twelve million, nine hundred six thousand, eight hundred twenty-one".