21001331023301 has 4 divisors (see below), whose sum is σ = 21448167853632. Its totient is φ = 20554494192972.

The previous prime is 21001331023241. The next prime is 21001331023319. The reversal of 21001331023301 is 10332013310012.

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 21001331023301 - 2¹⁴ = 21001331006917 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 (21001331023331) 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, 223418415095 + ... + 223418415188.

It is an arithmetic number, because the mean of its divisors is an integer number (5362041963408).

Almost surely, 2^{21001331023301} is an apocalyptic number.

It is an amenable number.

21001331023301 is a deficient number, since it is larger than the sum of its proper divisors (446836830331).

21001331023301 is an equidigital number, since it uses as much as digits as its factorization.

21001331023301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446836830330.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21001331023301 its reverse (10332013310012), we get a palindrome (31333344333313).

The spelling of 21001331023301 in words is "twenty-one trillion, one billion, three hundred thirty-one million, twenty-three thousand, three hundred one".