27421643 has 4 divisors (see below), whose sum is σ = 27528600. Its totient is φ = 27314688.

The previous prime is 27421631. The next prime is 27421673. The reversal of 27421643 is 34612472.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27421643 - 2⁴ = 27421627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27421613) 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, 53093 + ... + 53606.

It is an arithmetic number, because the mean of its divisors is an integer number (6882150).

Almost surely, 2^27421643 is an apocalyptic number.

27421643 is a deficient number, since it is larger than the sum of its proper divisors (106957).

27421643 is a wasteful number, since it uses less digits than its factorization.

27421643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106956.

The product of its digits is 8064, while the sum is 29.

The square root of 27421643 is about 5236.5678645464. The cubic root of 27421643 is about 301.5535814682.

The spelling of 27421643 in words is "twenty-seven million, four hundred twenty-one thousand, six hundred forty-three".