853013821 has 6 divisors (see below), whose sum is σ = 937610366. Its totient is φ = 775467000.

The previous prime is 853013803. The next prime is 853013839. The reversal of 853013821 is 128310358.

It is an interprime number because it is at equal distance from previous prime (853013803) and next prime (853013839).

It can be written as a sum of positive squares in only one way, i.e., 852932025 + 81796 = 29205^2 + 286^2 .

It is not a de Polignac number, because 853013821 - 2²³ = 844625213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853013881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3524730 + ... + 3524971.

Almost surely, 2^853013821 is an apocalyptic number.

It is an amenable number.

853013821 is a deficient number, since it is larger than the sum of its proper divisors (84596545).

853013821 is a wasteful number, since it uses less digits than its factorization.

853013821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049723 (or 7049712 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 853013821 is about 29206.4003430755. The cubic root of 853013821 is about 948.3864839941.

The spelling of 853013821 in words is "eight hundred fifty-three million, thirteen thousand, eight hundred twenty-one".