21056546101 has 8 divisors (see below), whose sum is σ = 21357055640. Its totient is φ = 20756362752.

The previous prime is 21056546099. The next prime is 21056546197. The reversal of 21056546101 is 10164565012.

It can be written as a sum of positive squares in 4 ways, for example, as 12407732100 + 8648814001 = 111390^2 + 92999^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21056546101 - 2¹ = 21056546099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056546701) 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 in 7 ways as a sum of consecutive naturals, for example, 49981 + ... + 211213.

It is an arithmetic number, because the mean of its divisors is an integer number (2669631955).

Almost surely, 2^21056546101 is an apocalyptic number.

It is an amenable number.

21056546101 is a deficient number, since it is larger than the sum of its proper divisors (300509539).

21056546101 is a wasteful number, since it uses less digits than its factorization.

21056546101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163095.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 21056546101 in words is "twenty-one billion, fifty-six million, five hundred forty-six thousand, one hundred one".