21056160841 has 4 divisors (see below), whose sum is σ = 21057874452. Its totient is φ = 21054447232.

The previous prime is 21056160821. The next prime is 21056160871. The reversal of 21056160841 is 14806165012.

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 2500000000 + 18556160841 = 50000^2 + 136221^2 .

It is a cyclic number.

It is not a de Polignac number, because 21056160841 - 2⁹ = 21056160329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21056160797 and 21056160806.

It is not an unprimeable number, because it can be changed into a prime (21056160821) 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, 838240 + ... + 862993.

It is an arithmetic number, because the mean of its divisors is an integer number (5264468613).

Almost surely, 2^21056160841 is an apocalyptic number.

It is an amenable number.

21056160841 is a deficient number, since it is larger than the sum of its proper divisors (1713611).

21056160841 is a wasteful number, since it uses less digits than its factorization.

21056160841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713610.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 21056160841 in words is "twenty-one billion, fifty-six million, one hundred sixty thousand, eight hundred forty-one".