27312221 has 8 divisors (see below), whose sum is σ = 27864000. Its totient is φ = 26763520.

The previous prime is 27312199. The next prime is 27312223. The reversal of 27312221 is 12221372.

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 27312221 - 2²² = 23117917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27312193 and 27312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27312223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25976 + ... + 27006.

It is an arithmetic number, because the mean of its divisors is an integer number (3483000).

Almost surely, 2^27312221 is an apocalyptic number.

It is an amenable number.

27312221 is a deficient number, since it is larger than the sum of its proper divisors (551779).

27312221 is a wasteful number, since it uses less digits than its factorization.

27312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539.

The product of its digits is 336, while the sum is 20.

The square root of 27312221 is about 5226.1095472636. The cubic root of 27312221 is about 301.1519451538.

Adding to 27312221 its reverse (12221372), we get a palindrome (39533593).

It can be divided in two parts, 273 and 12221, that multiplied together give a palindrome (3336333).

The spelling of 27312221 in words is "twenty-seven million, three hundred twelve thousand, two hundred twenty-one".