27429421 has 2 divisors, whose sum is σ = 27429422. Its totient is φ = 27429420.

The previous prime is 27429403. The next prime is 27429431. The reversal of 27429421 is 12492472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26409321 + 1020100 = 5139^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 27429421 - 2⁹ = 27428909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27429401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13714710 + 13714711.

It is an arithmetic number, because the mean of its divisors is an integer number (13714711).

Almost surely, 2^27429421 is an apocalyptic number.

It is an amenable number.

27429421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27429421 is an equidigital number, since it uses as much as digits as its factorization.

27429421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 27429421 is about 5237.3104738978. The cubic root of 27429421 is about 301.5820901177.

The spelling of 27429421 in words is "twenty-seven million, four hundred twenty-nine thousand, four hundred twenty-one".