27043421 has 4 divisors (see below), whose sum is σ = 27067392. Its totient is φ = 27019452.

The previous prime is 27043397. The next prime is 27043427. The reversal of 27043421 is 12434072.

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 a de Polignac number, because none of the positive numbers 2^k-27043421 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 (27043427) 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, 10205 + ... + 12578.

It is an arithmetic number, because the mean of its divisors is an integer number (6766848).

Almost surely, 2^27043421 is an apocalyptic number.

It is an amenable number.

27043421 is a deficient number, since it is larger than the sum of its proper divisors (23971).

27043421 is a wasteful number, since it uses less digits than its factorization.

27043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23970.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 27043421 is about 5200.3289319042. The cubic root of 27043421 is about 300.1607323868.

Adding to 27043421 its reverse (12434072), we get a palindrome (39477493).

The spelling of 27043421 in words is "twenty-seven million, forty-three thousand, four hundred twenty-one".