21056160871 has 2 divisors, whose sum is σ = 21056160872. Its totient is φ = 21056160870.

The previous prime is 21056160821. The next prime is 21056160887. The reversal of 21056160871 is 17806165012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21056160871 - 2¹³ = 21056152679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21056160871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21056160821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10528080435 + 10528080436.

It is an arithmetic number, because the mean of its divisors is an integer number (10528080436).

Almost surely, 2^21056160871 is an apocalyptic number.

21056160871 is a deficient number, since it is larger than the sum of its proper divisors (1).

21056160871 is an equidigital number, since it uses as much as digits as its factorization.

21056160871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 21056160871 in words is "twenty-one billion, fifty-six million, one hundred sixty thousand, eight hundred seventy-one".