1921483728413 has 2 divisors, whose sum is σ = 1921483728414. Its totient is φ = 1921483728412.

The previous prime is 1921483728391. The next prime is 1921483728499. The reversal of 1921483728413 is 3148273841291.

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., 1158729532249 + 762754196164 = 1076443^2 + 873358^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921483728413 - 2¹² = 1921483724317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921483778413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960741864206 + 960741864207.

It is an arithmetic number, because the mean of its divisors is an integer number (960741864207).

Almost surely, 2^{1921483728413} is an apocalyptic number.

It is an amenable number.

1921483728413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921483728413 is an equidigital number, since it uses as much as digits as its factorization.

1921483728413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 53.

The spelling of 1921483728413 in words is "one trillion, nine hundred twenty-one billion, four hundred eighty-three million, seven hundred twenty-eight thousand, four hundred thirteen".