27187421 has 2 divisors, whose sum is σ = 27187422. Its totient is φ = 27187420.

The previous prime is 27187417. The next prime is 27187441. The reversal of 27187421 is 12478172.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 11868025 = 3914^2 + 3445^2 .

It is a cyclic number.

It is not a de Polignac number, because 27187421 - 2² = 27187417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27187411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13593710 + 13593711.

It is an arithmetic number, because the mean of its divisors is an integer number (13593711).

Almost surely, 2^27187421 is an apocalyptic number.

It is an amenable number.

27187421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27187421 is an equidigital number, since it uses as much as digits as its factorization.

27187421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

The square root of 27187421 is about 5214.1558281279. The cubic root of 27187421 is about 300.6925518613.

The spelling of 27187421 in words is "twenty-seven million, one hundred eighty-seven thousand, four hundred twenty-one".