87852371821 has 4 divisors (see below), whose sum is σ = 87859716444. Its totient is φ = 87845027200.

The previous prime is 87852371819. The next prime is 87852371833. The reversal of 87852371821 is 12817325878.

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

It can be written as a sum of positive squares in 2 ways, for example, as 86016677796 + 1835694025 = 293286^2 + 42845^2 .

It is a cyclic number.

It is not a de Polignac number, because 87852371821 - 2¹ = 87852371819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87852371801) 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, 3654340 + ... + 3678301.

It is an arithmetic number, because the mean of its divisors is an integer number (21964929111).

Almost surely, 2^87852371821 is an apocalyptic number.

It is an amenable number.

87852371821 is a deficient number, since it is larger than the sum of its proper divisors (7344623).

87852371821 is a wasteful number, since it uses less digits than its factorization.

87852371821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7344622.

The product of its digits is 1505280, while the sum is 52.

The spelling of 87852371821 in words is "eighty-seven billion, eight hundred fifty-two million, three hundred seventy-one thousand, eight hundred twenty-one".