21001301 has 4 divisors (see below), whose sum is σ = 21049152. Its totient is φ = 20953452.

The previous prime is 21001247. The next prime is 21001319. The reversal of 21001301 is 10310012.

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 21001301 - 2¹⁰ = 21000277 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 (21001381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23261 + ... + 24146.

It is an arithmetic number, because the mean of its divisors is an integer number (5262288).

Almost surely, 2^21001301 is an apocalyptic number.

It is an amenable number.

21001301 is a deficient number, since it is larger than the sum of its proper divisors (47851).

21001301 is an equidigital number, since it uses as much as digits as its factorization.

21001301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47850.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 21001301 is about 4582.7176434950. The cubic root of 21001301 is about 275.8981149178.

Adding to 21001301 its reverse (10310012), we get a palindrome (31311313).

The spelling of 21001301 in words is "twenty-one million, one thousand, three hundred one".