821827533 has 4 divisors (see below), whose sum is σ = 1095770048. Its totient is φ = 547885020.

The previous prime is 821827507. The next prime is 821827621. The reversal of 821827533 is 335728128.

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 not a de Polignac number, because 821827533 - 2⁶ = 821827469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 821827491 and 821827500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821825533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136971253 + ... + 136971258.

It is an arithmetic number, because the mean of its divisors is an integer number (273942512).

Almost surely, 2^821827533 is an apocalyptic number.

It is an amenable number.

821827533 is a deficient number, since it is larger than the sum of its proper divisors (273942515).

821827533 is a wasteful number, since it uses less digits than its factorization.

821827533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273942514.

The product of its digits is 80640, while the sum is 39.

The square root of 821827533 is about 28667.5344771747. The cubic root of 821827533 is about 936.6849930911.

The spelling of 821827533 in words is "eight hundred twenty-one million, eight hundred twenty-seven thousand, five hundred thirty-three".