27312121 has 4 divisors (see below), whose sum is σ = 27331200. Its totient is φ = 27293044.

The previous prime is 27312107. The next prime is 27312133. The reversal of 27312121 is 12121372.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27312121 - 2¹⁵ = 27279353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27312151) 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, 7201 + ... + 10318.

It is an arithmetic number, because the mean of its divisors is an integer number (6832800).

Almost surely, 2^27312121 is an apocalyptic number.

It is an amenable number.

27312121 is a deficient number, since it is larger than the sum of its proper divisors (19079).

27312121 is a wasteful number, since it uses less digits than its factorization.

27312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19078.

The product of its digits is 168, while the sum is 19.

The square root of 27312121 is about 5226.0999799085. The cubic root of 27312121 is about 301.1515776110.

Adding to 27312121 its reverse (12121372), we get a palindrome (39433493).

It can be divided in two parts, 273 and 12121, that multiplied together give a palindrome (3309033).

The spelling of 27312121 in words is "twenty-seven million, three hundred twelve thousand, one hundred twenty-one".