27312121013 has 4 divisors (see below), whose sum is σ = 27978270348. Its totient is φ = 26645971680.

The previous prime is 27312121009. The next prime is 27312121049. The reversal of 27312121013 is 31012121372.

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 11596489969 + 15715631044 = 107687^2 + 125362^2 .

It is a cyclic number.

It is not a de Polignac number, because 27312121013 - 2² = 27312121009 is a prime.

It is a super-2 number, since 2×27312121013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27312121013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27312121313) 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, 333074606 + ... + 333074687.

It is an arithmetic number, because the mean of its divisors is an integer number (6994567587).

Almost surely, 2^27312121013 is an apocalyptic number.

It is an amenable number.

27312121013 is a deficient number, since it is larger than the sum of its proper divisors (666149335).

27312121013 is an equidigital number, since it uses as much as digits as its factorization.

27312121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666149334.

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

Adding to 27312121013 its reverse (31012121372), we get a palindrome (58324242385).

The spelling of 27312121013 in words is "twenty-seven billion, three hundred twelve million, one hundred twenty-one thousand, thirteen".