853528021 has 2 divisors, whose sum is σ = 853528022. Its totient is φ = 853528020.

The previous prime is 853528019. The next prime is 853528063. The reversal of 853528021 is 120825358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 853457796 + 70225 = 29214^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 853528021 - 2¹ = 853528019 is a prime.

Together with 853528019, 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 (853528001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426764010 + 426764011.

It is an arithmetic number, because the mean of its divisors is an integer number (426764011).

Almost surely, 2^853528021 is an apocalyptic number.

It is an amenable number.

853528021 is a deficient number, since it is larger than the sum of its proper divisors (1).

853528021 is an equidigital number, since it uses as much as digits as its factorization.

853528021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 853528021 is about 29215.2018818970. The cubic root of 853528021 is about 948.5770093850.

The spelling of 853528021 in words is "eight hundred fifty-three million, five hundred twenty-eight thousand, twenty-one".