27755813321 has 4 divisors (see below), whose sum is σ = 27758169600. Its totient is φ = 27753457044.

The previous prime is 27755813303. The next prime is 27755813381. The reversal of 27755813321 is 12331855772.

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 27755813321 - 2⁶ = 27755813257 is a prime.

It is a super-2 number, since 2×27755813321² (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 (27755813381) 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, 1160381 + ... + 1184058.

It is an arithmetic number, because the mean of its divisors is an integer number (6939542400).

Almost surely, 2^27755813321 is an apocalyptic number.

It is an amenable number.

27755813321 is a deficient number, since it is larger than the sum of its proper divisors (2356279).

27755813321 is a wasteful number, since it uses less digits than its factorization.

27755813321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356278.

The product of its digits is 352800, while the sum is 44.

The spelling of 27755813321 in words is "twenty-seven billion, seven hundred fifty-five million, eight hundred thirteen thousand, three hundred twenty-one".