20312030309621 has 2 divisors, whose sum is σ = 20312030309622. Its totient is φ = 20312030309620.

The previous prime is 20312030309609. The next prime is 20312030309699. The reversal of 20312030309621 is 12690303021302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12156979262596 + 8155051047025 = 3486686^2 + 2855705^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312030309621 - 2¹⁴ = 20312030293237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312030369621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156015154810 + 10156015154811.

It is an arithmetic number, because the mean of its divisors is an integer number (10156015154811).

Almost surely, 2^{20312030309621} is an apocalyptic number.

It is an amenable number.

20312030309621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312030309621 is an equidigital number, since it uses as much as digits as its factorization.

20312030309621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 20312030309621 in words is "twenty trillion, three hundred twelve billion, thirty million, three hundred nine thousand, six hundred twenty-one".