21031320301 has 4 divisors (see below), whose sum is σ = 21345220672. Its totient is φ = 20717419932.

The previous prime is 21031320281. The next prime is 21031320307. The reversal of 21031320301 is 10302313012.

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 a de Polignac number, because none of the positive numbers 2^k-21031320301 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 (21031320307) 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, 156950085 + ... + 156950218.

It is an arithmetic number, because the mean of its divisors is an integer number (5336305168).

Almost surely, 2^21031320301 is an apocalyptic number.

It is an amenable number.

21031320301 is a deficient number, since it is larger than the sum of its proper divisors (313900371).

21031320301 is an equidigital number, since it uses as much as digits as its factorization.

21031320301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313900370.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031320301 its reverse (10302313012), we get a palindrome (31333633313).

The spelling of 21031320301 in words is "twenty-one billion, thirty-one million, three hundred twenty thousand, three hundred one".