21316732601 has 4 divisors (see below), whose sum is σ = 21384837492. Its totient is φ = 21248627712.

The previous prime is 21316732589. The next prime is 21316732609. The reversal of 21316732601 is 10623761312.

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 9970222201 + 11346510400 = 99851^2 + 106520^2 .

It is a cyclic number.

It is not a de Polignac number, because 21316732601 - 2¹⁸ = 21316470457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21316732609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34051976 + ... + 34052601.

It is an arithmetic number, because the mean of its divisors is an integer number (5346209373).

Almost surely, 2^21316732601 is an apocalyptic number.

It is an amenable number.

21316732601 is a deficient number, since it is larger than the sum of its proper divisors (68104891).

21316732601 is an equidigital number, since it uses as much as digits as its factorization.

21316732601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68104890.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 21316732601 in words is "twenty-one billion, three hundred sixteen million, seven hundred thirty-two thousand, six hundred one".