27406021 has 2 divisors, whose sum is σ = 27406022. Its totient is φ = 27406020.

The previous prime is 27406013. The next prime is 27406039. The reversal of 27406021 is 12060472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 3101121 = 4930^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 27406021 - 2³ = 27406013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27405983 and 27406001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27406051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13703010 + 13703011.

It is an arithmetic number, because the mean of its divisors is an integer number (13703011).

Almost surely, 2^27406021 is an apocalyptic number.

It is an amenable number.

27406021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27406021 is an equidigital number, since it uses as much as digits as its factorization.

27406021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 27406021 is about 5235.0760261910. The cubic root of 27406021 is about 301.4963059684.

Adding to 27406021 its reverse (12060472), we get a palindrome (39466493).

The spelling of 27406021 in words is "twenty-seven million, four hundred six thousand, twenty-one".