27438411221 has 4 divisors (see below), whose sum is σ = 29549058252. Its totient is φ = 25327764192.

The previous prime is 27438411199. The next prime is 27438411229. The reversal of 27438411221 is 12211483472.

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 17031555025 + 10406856196 = 130505^2 + 102014^2 .

It is a cyclic number.

It is not a de Polignac number, because 27438411221 - 2³⁴ = 10258542037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27438411229) 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, 1055323496 + ... + 1055323521.

It is an arithmetic number, because the mean of its divisors is an integer number (7387264563).

Almost surely, 2^27438411221 is an apocalyptic number.

It is an amenable number.

27438411221 is a deficient number, since it is larger than the sum of its proper divisors (2110647031).

27438411221 is a wasteful number, since it uses less digits than its factorization.

27438411221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110647030.

The product of its digits is 21504, while the sum is 35.

Adding to 27438411221 its reverse (12211483472), we get a palindrome (39649894693).

The spelling of 27438411221 in words is "twenty-seven billion, four hundred thirty-eight million, four hundred eleven thousand, two hundred twenty-one".