27001921 has 2 divisors, whose sum is σ = 27001922. Its totient is φ = 27001920.

The previous prime is 27001913. The next prime is 27001927. The reversal of 27001921 is 12910072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 6071296 = 4575^2 + 2464^2 .

It is a cyclic number.

It is not a de Polignac number, because 27001921 - 2³ = 27001913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27001892 and 27001901.

It is not a weakly prime, because it can be changed into another prime (27001927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13500960 + 13500961.

It is an arithmetic number, because the mean of its divisors is an integer number (13500961).

Almost surely, 2^27001921 is an apocalyptic number.

It is an amenable number.

27001921 is a deficient number, since it is larger than the sum of its proper divisors (1).

27001921 is an equidigital number, since it uses as much as digits as its factorization.

27001921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 27001921 is about 5196.3372677300. The cubic root of 27001921 is about 300.0071146461.

Adding to 27001921 its reverse (12910072), we get a palindrome (39911993).

The spelling of 27001921 in words is "twenty-seven million, one thousand, nine hundred twenty-one".