27421021 has 8 divisors (see below), whose sum is σ = 27834840. Its totient is φ = 27010368.

The previous prime is 27421013. The next prime is 27421039. The reversal of 27421021 is 12012472.

27421021 = T₂₃₅ + T₂₃₆ + ... + T₅₆₁.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16695396 + 10725625 = 4086^2 + 3275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27421021 - 2³ = 27421013 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 27421021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27421421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20835 + ... + 22111.

It is an arithmetic number, because the mean of its divisors is an integer number (3479355).

Almost surely, 2^27421021 is an apocalyptic number.

It is an amenable number.

27421021 is a deficient number, since it is larger than the sum of its proper divisors (413819).

27421021 is a wasteful number, since it uses less digits than its factorization.

27421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 27421021 is about 5236.5084741648. The cubic root of 27421021 is about 301.5513014231.

Adding to 27421021 its reverse (12012472), we get a palindrome (39433493).

The spelling of 27421021 in words is "twenty-seven million, four hundred twenty-one thousand, twenty-one".