1921528433089 has 16 divisors (see below), whose sum is σ = 2016208141200. Its totient is φ = 1828916216064.

The previous prime is 1921528433081. The next prime is 1921528433129. The reversal of 1921528433089 is 9803348251291.

It can be written as a sum of positive squares in 8 ways, for example, as 735134760000 + 1186393673089 = 857400^2 + 1089217^2 .

It is not a de Polignac number, because 1921528433089 - 2³ = 1921528433081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921528433081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920142 + ... + 2165575.

It is an arithmetic number, because the mean of its divisors is an integer number (126013008825).

Almost surely, 2^{1921528433089} is an apocalyptic number.

It is an amenable number.

1921528433089 is a deficient number, since it is larger than the sum of its proper divisors (94679708111).

1921528433089 is a wasteful number, since it uses less digits than its factorization.

1921528433089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086052.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 1921528433089 in words is "one trillion, nine hundred twenty-one billion, five hundred twenty-eight million, four hundred thirty-three thousand, eighty-nine".