27470447921 has 4 divisors (see below), whose sum is σ = 31394797632. Its totient is φ = 23546098212.

The previous prime is 27470447909. The next prime is 27470447929. The reversal of 27470447921 is 12974407472.

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 de Polignac number, because none of the positive numbers 2^k-27470447921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27470447929) 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, 1962174845 + ... + 1962174858.

It is an arithmetic number, because the mean of its divisors is an integer number (7848699408).

Almost surely, 2^27470447921 is an apocalyptic number.

It is an amenable number.

27470447921 is a deficient number, since it is larger than the sum of its proper divisors (3924349711).

27470447921 is an equidigital number, since it uses as much as digits as its factorization.

27470447921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924349710.

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 27470447921 in words is "twenty-seven billion, four hundred seventy million, four hundred forty-seven thousand, nine hundred twenty-one".