21312121301 has 8 divisors (see below), whose sum is σ = 21392199000. Its totient is φ = 21232189440.

The previous prime is 21312121289. The next prime is 21312121351. The reversal of 21312121301 is 10312121312.

It can be written as a sum of positive squares in 4 ways, for example, as 3094140625 + 18217980676 = 55625^2 + 134974^2 .

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 21312121301 - 2³⁰ = 20238379477 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 21312121301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312121351) 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 7 ways as a sum of consecutive naturals, for example, 260885 + ... + 332693.

It is an arithmetic number, because the mean of its divisors is an integer number (2674024875).

Almost surely, 2^21312121301 is an apocalyptic number.

It is an amenable number.

21312121301 is a deficient number, since it is larger than the sum of its proper divisors (80077699).

21312121301 is an equidigital number, since it uses as much as digits as its factorization.

21312121301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72919.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21312121301 its reverse (10312121312), we get a palindrome (31624242613).

The spelling of 21312121301 in words is "twenty-one billion, three hundred twelve million, one hundred twenty-one thousand, three hundred one".