270891021 has 4 divisors (see below), whose sum is σ = 361188032. Its totient is φ = 180594012.

The previous prime is 270891017. The next prime is 270891029. The reversal of 270891021 is 120198072.

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 270891021 - 2² = 270891017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 270891021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (270891029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45148501 + ... + 45148506.

It is an arithmetic number, because the mean of its divisors is an integer number (90297008).

Almost surely, 2^270891021 is an apocalyptic number.

It is an amenable number.

270891021 is a deficient number, since it is larger than the sum of its proper divisors (90297011).

270891021 is an equidigital number, since it uses as much as digits as its factorization.

270891021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90297010.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 270891021 is about 16458.7672989201. The cubic root of 270891021 is about 647.0406065481.

The spelling of 270891021 in words is "two hundred seventy million, eight hundred ninety-one thousand, twenty-one".