27381421 has 4 divisors (see below), whose sum is σ = 27502272. Its totient is φ = 27260572.

The previous prime is 27381397. The next prime is 27381427. The reversal of 27381421 is 12418372.

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 27381421 - 2¹⁹ = 26857133 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 27381421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27381427) 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, 60085 + ... + 60538.

It is an arithmetic number, because the mean of its divisors is an integer number (6875568).

Almost surely, 2^27381421 is an apocalyptic number.

It is an amenable number.

27381421 is a deficient number, since it is larger than the sum of its proper divisors (120851).

27381421 is a wasteful number, since it uses less digits than its factorization.

27381421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120850.

The product of its digits is 2688, while the sum is 28.

The square root of 27381421 is about 5232.7259626317. The cubic root of 27381421 is about 301.4060699655.

Adding to 27381421 its reverse (12418372), we get a palindrome (39799793).

The spelling of 27381421 in words is "twenty-seven million, three hundred eighty-one thousand, four hundred twenty-one".