21001033301 has 4 divisors (see below), whose sum is σ = 21092741100. Its totient is φ = 20909325504.

The previous prime is 21001033267. The next prime is 21001033321. The reversal of 21001033301 is 10333010012.

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 15413470801 + 5587562500 = 124151^2 + 74750^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001033301 - 2³⁴ = 3821164117 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 (21001033321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45853556 + ... + 45854013.

It is an arithmetic number, because the mean of its divisors is an integer number (5273185275).

Almost surely, 2^21001033301 is an apocalyptic number.

It is an amenable number.

21001033301 is a deficient number, since it is larger than the sum of its proper divisors (91707799).

21001033301 is an equidigital number, since it uses as much as digits as its factorization.

21001033301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91707798.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21001033301 its reverse (10333010012), we get a palindrome (31334043313).

The spelling of 21001033301 in words is "twenty-one billion, one million, thirty-three thousand, three hundred one".