27020921 has 4 divisors (see below), whose sum is σ = 27218292. Its totient is φ = 26823552.

The previous prime is 27020909. The next prime is 27020941. The reversal of 27020921 is 12902072.

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 18835600 + 8185321 = 4340^2 + 2861^2 .

It is a cyclic number.

It is not a de Polignac number, because 27020921 - 2⁶ = 27020857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27020941) 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, 98480 + ... + 98753.

It is an arithmetic number, because the mean of its divisors is an integer number (6804573).

Almost surely, 2^27020921 is an apocalyptic number.

It is an amenable number.

27020921 is a deficient number, since it is larger than the sum of its proper divisors (197371).

27020921 is a wasteful number, since it uses less digits than its factorization.

27020921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197370.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 27020921 is about 5198.1651570530. The cubic root of 27020921 is about 300.0774651806.

Adding to 27020921 its reverse (12902072), we get a palindrome (39922993).

The spelling of 27020921 in words is "twenty-seven million, twenty thousand, nine hundred twenty-one".