21180486873 has 32 divisors (see below), whose sum is σ = 36587084800. Its totient is φ = 10584115776.

The previous prime is 21180486857. The next prime is 21180486883. The reversal of 21180486873 is 37868408112.

It is not a de Polignac number, because 21180486873 - 2⁴ = 21180486857 is a prime.

It is a super-2 number, since 2×21180486873² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21180486853) 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 31 ways as a sum of consecutive naturals, for example, 2036503 + ... + 2046876.

It is an arithmetic number, because the mean of its divisors is an integer number (1143346400).

Almost surely, 2^21180486873 is an apocalyptic number.

It is an amenable number.

21180486873 is a deficient number, since it is larger than the sum of its proper divisors (15406597927).

21180486873 is a wasteful number, since it uses less digits than its factorization.

21180486873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083421.

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 21180486873 in words is "twenty-one billion, one hundred eighty million, four hundred eighty-six thousand, eight hundred seventy-three".