8025529921921 has 4 divisors (see below), whose sum is σ = 8025543818244. Its totient is φ = 8025516025600.

The previous prime is 8025529921897. The next prime is 8025529921933. The reversal of 8025529921921 is 1291299255208.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5267190241296 + 2758339680625 = 2295036^2 + 1660825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8025529921921 is a prime.

It is a super-3 number, since 3×8025529921921³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8025529921961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6042520 + ... + 7250041.

It is an arithmetic number, because the mean of its divisors is an integer number (2006385954561).

Almost surely, 2^{8025529921921} is an apocalyptic number.

It is an amenable number.

8025529921921 is a deficient number, since it is larger than the sum of its proper divisors (13896323).

8025529921921 is a wasteful number, since it uses less digits than its factorization.

8025529921921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13896322.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 8025529921921 in words is "eight trillion, twenty-five billion, five hundred twenty-nine million, nine hundred twenty-one thousand, nine hundred twenty-one".