27208921 has 4 divisors (see below), whose sum is σ = 27366372. Its totient is φ = 27051472.

The previous prime is 27208919. The next prime is 27208927. The reversal of 27208921 is 12980272.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23386896 + 3822025 = 4836^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 27208921 - 2¹ = 27208919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27208927) 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, 78466 + ... + 78811.

It is an arithmetic number, because the mean of its divisors is an integer number (6841593).

Almost surely, 2^27208921 is an apocalyptic number.

It is an amenable number.

27208921 is a deficient number, since it is larger than the sum of its proper divisors (157451).

27208921 is a wasteful number, since it uses less digits than its factorization.

27208921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157450.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 27208921 is about 5216.2171158801. The cubic root of 27208921 is about 300.7717942244.

The spelling of 27208921 in words is "twenty-seven million, two hundred eight thousand, nine hundred twenty-one".