827572021 has 4 divisors (see below), whose sum is σ = 828017152. Its totient is φ = 827126892.

The previous prime is 827572013. The next prime is 827572061. The reversal of 827572021 is 120275728.

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 827572021 - 2³ = 827572013 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 (827572061) 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, 219765 + ... + 223498.

It is an arithmetic number, because the mean of its divisors is an integer number (207004288).

Almost surely, 2^827572021 is an apocalyptic number.

It is an amenable number.

827572021 is a deficient number, since it is larger than the sum of its proper divisors (445131).

827572021 is a wasteful number, since it uses less digits than its factorization.

827572021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445130.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 827572021 is about 28767.5515294576. The cubic root of 827572021 is about 938.8623709177.

The spelling of 827572021 in words is "eight hundred twenty-seven million, five hundred seventy-two thousand, twenty-one".