853261021 has 4 divisors (see below), whose sum is σ = 854255200. Its totient is φ = 852266844.

The previous prime is 853261007. The next prime is 853261037. The reversal of 853261021 is 120162358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 853261021 - 2⁷ = 853260893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853261051) 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, 495801 + ... + 497518.

It is an arithmetic number, because the mean of its divisors is an integer number (213563800).

Almost surely, 2^853261021 is an apocalyptic number.

It is an amenable number.

853261021 is a deficient number, since it is larger than the sum of its proper divisors (994179).

853261021 is an equidigital number, since it uses as much as digits as its factorization.

853261021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994178.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 853261021 is about 29210.6319856315. The cubic root of 853261021 is about 948.4780880182.

The spelling of 853261021 in words is "eight hundred fifty-three million, two hundred sixty-one thousand, twenty-one".