27781014921 has 16 divisors (see below), whose sum is σ = 40514273280. Its totient is φ = 16793010320.

The previous prime is 27781014913. The next prime is 27781014931. The reversal of 27781014921 is 12941018772.

It is a cyclic number.

It is not a de Polignac number, because 27781014921 - 2³ = 27781014913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27781014931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086381 + ... + 1111658.

It is an arithmetic number, because the mean of its divisors is an integer number (2532142080).

Almost surely, 2^27781014921 is an apocalyptic number.

It is an amenable number.

27781014921 is a deficient number, since it is larger than the sum of its proper divisors (12733258359).

27781014921 is a wasteful number, since it uses less digits than its factorization.

27781014921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198436.

The product of its (nonzero) digits is 56448, while the sum is 42.

The spelling of 27781014921 in words is "twenty-seven billion, seven hundred eighty-one million, fourteen thousand, nine hundred twenty-one".