27877893121 has 4 divisors (see below), whose sum is σ = 30022346452. Its totient is φ = 25733439792.

The previous prime is 27877893103. The next prime is 27877893137. The reversal of 27877893121 is 12139877872.

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 8894564721 + 18983328400 = 94311^2 + 137780^2 .

It is a cyclic number.

It is not a de Polignac number, because 27877893121 - 2¹¹ = 27877891073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27877893151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072226646 + ... + 1072226671.

It is an arithmetic number, because the mean of its divisors is an integer number (7505586613).

Almost surely, 2^27877893121 is an apocalyptic number.

It is an amenable number.

27877893121 is a deficient number, since it is larger than the sum of its proper divisors (2144453331).

27877893121 is a wasteful number, since it uses less digits than its factorization.

27877893121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144453330.

The product of its digits is 2370816, while the sum is 55.

The spelling of 27877893121 in words is "twenty-seven billion, eight hundred seventy-seven million, eight hundred ninety-three thousand, one hundred twenty-one".