27105421 has 4 divisors (see below), whose sum is σ = 30977632. Its totient is φ = 23233212.

The previous prime is 27105413. The next prime is 27105443. The reversal of 27105421 is 12450172.

It is a happy number.

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 27105421 - 2³ = 27105413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27105392 and 27105401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27105461) 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, 1936095 + ... + 1936108.

It is an arithmetic number, because the mean of its divisors is an integer number (7744408).

Almost surely, 2^27105421 is an apocalyptic number.

It is an amenable number.

27105421 is a deficient number, since it is larger than the sum of its proper divisors (3872211).

27105421 is an equidigital number, since it uses as much as digits as its factorization.

27105421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3872210.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 27105421 is about 5206.2866805431. The cubic root of 27105421 is about 300.3899410817.

Adding to 27105421 its reverse (12450172), we get a palindrome (39555593).

It can be divided in two parts, 2710 and 5421, that multiplied together give a triangular number (14690910 = T₅₄₂₀).

The spelling of 27105421 in words is "twenty-seven million, one hundred five thousand, four hundred twenty-one".