18827202323821 has 2 divisors, whose sum is σ = 18827202323822. Its totient is φ = 18827202323820.

The previous prime is 18827202323819. The next prime is 18827202323833. The reversal of 18827202323821 is 12832320272881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17009141117796 + 1818061206025 = 4124214^2 + 1348355^2 .

It is a cyclic number.

It is not a de Polignac number, because 18827202323821 - 2¹ = 18827202323819 is a prime.

Together with 18827202323819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18827202303821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9413601161910 + 9413601161911.

It is an arithmetic number, because the mean of its divisors is an integer number (9413601161911).

Almost surely, 2^{18827202323821} is an apocalyptic number.

It is an amenable number.

18827202323821 is a deficient number, since it is larger than the sum of its proper divisors (1).

18827202323821 is an equidigital number, since it uses as much as digits as its factorization.

18827202323821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 18827202323821 in words is "eighteen trillion, eight hundred twenty-seven billion, two hundred two million, three hundred twenty-three thousand, eight hundred twenty-one".