87021172947 has 4 divisors (see below), whose sum is σ = 116028230600. Its totient is φ = 58014115296.

The previous prime is 87021172939. The next prime is 87021172951. The reversal of 87021172947 is 74927112078.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87021172947 - 2³ = 87021172939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87021172896 and 87021172905.

It is not an unprimeable number, because it can be changed into a prime (87021173947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14503528822 + ... + 14503528827.

It is an arithmetic number, because the mean of its divisors is an integer number (29007057650).

Almost surely, 2^87021172947 is an apocalyptic number.

87021172947 is a deficient number, since it is larger than the sum of its proper divisors (29007057653).

87021172947 is a wasteful number, since it uses less digits than its factorization.

87021172947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29007057652.

The product of its (nonzero) digits is 395136, while the sum is 48.

The spelling of 87021172947 in words is "eighty-seven billion, twenty-one million, one hundred seventy-two thousand, nine hundred forty-seven".