270021 has 4 divisors (see below), whose sum is σ = 360032. Its totient is φ = 180012.

The previous prime is 270001. The next prime is 270029. The reversal of 270021 is 120072.

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 270021 - 2¹⁰ = 268997 is a prime.

It is a super-2 number, since 2×270021² = 145822680882, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

270021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 269979 and 270006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (270029) 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, 45001 + ... + 45006.

It is an arithmetic number, because the mean of its divisors is an integer number (90008).

2²⁷⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

270021 is a deficient number, since it is larger than the sum of its proper divisors (90011).

270021 is an equidigital number, since it uses as much as digits as its factorization.

270021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90010.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 270021 is about 519.6354491372. The cubic root of 270021 is about 64.6347163289.

Adding to 270021 its reverse (120072), we get a palindrome (390093).

The spelling of 270021 in words is "two hundred seventy thousand, twenty-one", and thus it is an iban number.