21061843873 has 8 divisors (see below), whose sum is σ = 24071618880. Its totient is φ = 18052303920.

The previous prime is 21061843849. The next prime is 21061843877. The reversal of 21061843873 is 37834816012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21061843873 - 2²⁹ = 20524972961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21061843877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223923 + ... + 303751.

It is an arithmetic number, because the mean of its divisors is an integer number (3008952360).

Almost surely, 2^21061843873 is an apocalyptic number.

It is an amenable number.

21061843873 is a deficient number, since it is larger than the sum of its proper divisors (3009775007).

21061843873 is an equidigital number, since it uses as much as digits as its factorization.

21061843873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117527.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 21061843873 in words is "twenty-one billion, sixty-one million, eight hundred forty-three thousand, eight hundred seventy-three".