27771581321 has 24 divisors (see below), whose sum is σ = 30895623360. Its totient is φ = 24942883680.

The previous prime is 27771581269. The next prime is 27771581381. The reversal of 27771581321 is 12318517772.

It is a de Polignac number, because none of the positive numbers 2^k-27771581321 is a prime.

It is a super-2 number, since 2×27771581321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27771581381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3396380 + ... + 3404546.

It is an arithmetic number, because the mean of its divisors is an integer number (1287317640).

Almost surely, 2^27771581321 is an apocalyptic number.

It is an amenable number.

27771581321 is a deficient number, since it is larger than the sum of its proper divisors (3124042039).

27771581321 is a wasteful number, since it uses less digits than its factorization.

27771581321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8525 (or 8514 counting only the distinct ones).

The product of its digits is 164640, while the sum is 44.

The spelling of 27771581321 in words is "twenty-seven billion, seven hundred seventy-one million, five hundred eighty-one thousand, three hundred twenty-one".