27719961921 has 12 divisors (see below), whose sum is σ = 40046542848. Its totient is φ = 18476929464.

The previous prime is 27719961877. The next prime is 27719961923. The reversal of 27719961921 is 12916991772.

27719961921 is a `hidden beast` number, since 2 + 7 + 7 + 19 + 9 + 619 + 2 + 1 = 666.

It is not a de Polignac number, because 27719961921 - 2¹⁴ = 27719945537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27719961923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195405 + ... + 305978.

It is an arithmetic number, because the mean of its divisors is an integer number (3337211904).

Almost surely, 2^27719961921 is an apocalyptic number.

It is an amenable number.

27719961921 is a deficient number, since it is larger than the sum of its proper divisors (12326580927).

27719961921 is a wasteful number, since it uses less digits than its factorization.

27719961921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507532 (or 507529 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The spelling of 27719961921 in words is "twenty-seven billion, seven hundred nineteen million, nine hundred sixty-one thousand, nine hundred twenty-one".