21086852152873 has 4 divisors (see below), whose sum is σ = 22708917703108. Its totient is φ = 19464786602640.

The previous prime is 21086852152841. The next prime is 21086852153051. The reversal of 21086852152873 is 37825125868012.

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 2160758882304 + 18926093270569 = 1469952^2 + 4350413^2 .

It is a cyclic number.

It is not a de Polignac number, because 21086852152873 - 2⁵ = 21086852152841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21086852150873) 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, 811032775098 + ... + 811032775123.

It is an arithmetic number, because the mean of its divisors is an integer number (5677229425777).

Almost surely, 2^{21086852152873} is an apocalyptic number.

It is an amenable number.

21086852152873 is a deficient number, since it is larger than the sum of its proper divisors (1622065550235).

21086852152873 is a wasteful number, since it uses less digits than its factorization.

21086852152873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622065550234.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 21086852152873 in words is "twenty-one trillion, eighty-six billion, eight hundred fifty-two million, one hundred fifty-two thousand, eight hundred seventy-three".