21322718101 has 4 divisors (see below), whose sum is σ = 21323334604. Its totient is φ = 21322101600.

The previous prime is 21322718069. The next prime is 21322718111. The reversal of 21322718101 is 10181722312.

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 6150637476 + 15172080625 = 78426^2 + 123175^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322718101 - 2⁵ = 21322718069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21322718101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322718111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253080 + ... + 326641.

It is an arithmetic number, because the mean of its divisors is an integer number (5330833651).

Almost surely, 2^21322718101 is an apocalyptic number.

It is an amenable number.

21322718101 is a deficient number, since it is larger than the sum of its proper divisors (616503).

21322718101 is an equidigital number, since it uses as much as digits as its factorization.

21322718101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616502.

The product of its (nonzero) digits is 1344, while the sum is 28.

The spelling of 21322718101 in words is "twenty-one billion, three hundred twenty-two million, seven hundred eighteen thousand, one hundred one".