27230821 has 4 divisors (see below), whose sum is σ = 28832652. Its totient is φ = 25628992.

The previous prime is 27230807. The next prime is 27230851. The reversal of 27230821 is 12803272.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21986721 + 5244100 = 4689^2 + 2290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27230821 is a prime.

It is a super-2 number, since 2×27230821² = 1483035224668082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27230851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800890 + ... + 800923.

It is an arithmetic number, because the mean of its divisors is an integer number (7208163).

Almost surely, 2^27230821 is an apocalyptic number.

It is an amenable number.

27230821 is a deficient number, since it is larger than the sum of its proper divisors (1601831).

27230821 is a wasteful number, since it uses less digits than its factorization.

27230821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601830.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 27230821 is about 5218.3159160787. The cubic root of 27230821 is about 300.8524679594.

The spelling of 27230821 in words is "twenty-seven million, two hundred thirty thousand, eight hundred twenty-one".