84921703947 has 6 divisors (see below), whose sum is σ = 122664683492. Its totient is φ = 56614469292.

The previous prime is 84921703903. The next prime is 84921703981. The reversal of 84921703947 is 74930712948.

84921703947 is a `hidden beast` number, since 84 + 9 + 2 + 170 + 394 + 7 = 666.

It is not a de Polignac number, because 84921703947 - 2¹² = 84921699851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84921703893 and 84921703902.

It is not an unprimeable number, because it can be changed into a prime (84921703547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4717872433 + ... + 4717872450.

Almost surely, 2^84921703947 is an apocalyptic number.

84921703947 is a deficient number, since it is larger than the sum of its proper divisors (37742979545).

84921703947 is a wasteful number, since it uses less digits than its factorization.

84921703947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9435744889 (or 9435744886 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

Subtracting from 84921703947 its reverse (74930712948), we obtain a palindrome (9990990999).

The spelling of 84921703947 in words is "eighty-four billion, nine hundred twenty-one million, seven hundred three thousand, nine hundred forty-seven".