18454387283021 has 2 divisors, whose sum is σ = 18454387283022. Its totient is φ = 18454387283020.

The previous prime is 18454387282999. The next prime is 18454387283029. The reversal of 18454387283021 is 12038278345481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16570394955625 + 1883992327396 = 4070675^2 + 1372586^2 .

It is a cyclic number.

It is not a de Polignac number, because 18454387283021 - 2¹⁰ = 18454387281997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18454387283029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227193641510 + 9227193641511.

It is an arithmetic number, because the mean of its divisors is an integer number (9227193641511).

Almost surely, 2^{18454387283021} is an apocalyptic number.

It is an amenable number.

18454387283021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18454387283021 is an equidigital number, since it uses as much as digits as its factorization.

18454387283021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10321920, while the sum is 56.

The spelling of 18454387283021 in words is "eighteen trillion, four hundred fifty-four billion, three hundred eighty-seven million, two hundred eighty-three thousand, twenty-one".