21331021301 has 4 divisors (see below), whose sum is σ = 21337759872. Its totient is φ = 21324282732.

The previous prime is 21331021279. The next prime is 21331021319. The reversal of 21331021301 is 10312013312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21331021301 - 2⁶ = 21331021237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21331021301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331021321) 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, 3364535 + ... + 3370868.

It is an arithmetic number, because the mean of its divisors is an integer number (5334439968).

Almost surely, 2^21331021301 is an apocalyptic number.

It is an amenable number.

21331021301 is a deficient number, since it is larger than the sum of its proper divisors (6738571).

21331021301 is an equidigital number, since it uses as much as digits as its factorization.

21331021301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738570.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21331021301 its reverse (10312013312), we get a palindrome (31643034613).

The spelling of 21331021301 in words is "twenty-one billion, three hundred thirty-one million, twenty-one thousand, three hundred one".