21320421003001 has 4 divisors (see below), whose sum is σ = 21325145231092. Its totient is φ = 21315696774912.

The previous prime is 21320421002897. The next prime is 21320421003043. The reversal of 21320421003001 is 10030012402312.

It is a happy number.

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 326613393001 + 20993807610000 = 571501^2 + 4581900^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320421003001 - 2¹⁹ = 21320420478713 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 21320421003001.

It is not an unprimeable number, because it can be changed into a prime (21320421003061) 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, 2362107276 + ... + 2362116301.

It is an arithmetic number, because the mean of its divisors is an integer number (5331286307773).

Almost surely, 2^{21320421003001} is an apocalyptic number.

It is an amenable number.

21320421003001 is a deficient number, since it is larger than the sum of its proper divisors (4724228091).

21320421003001 is an equidigital number, since it uses as much as digits as its factorization.

21320421003001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724228090.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21320421003001 its reverse (10030012402312), we get a palindrome (31350433405313).

The spelling of 21320421003001 in words is "twenty-one trillion, three hundred twenty billion, four hundred twenty-one million, three thousand, one".