21131301 has 4 divisors (see below), whose sum is σ = 28175072. Its totient is φ = 14087532.

The previous prime is 21131293. The next prime is 21131317. The reversal of 21131301 is 10313112.

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 not a de Polignac number, because 21131301 - 2³ = 21131293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131701) 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, 3521881 + ... + 3521886.

It is an arithmetic number, because the mean of its divisors is an integer number (7043768).

Almost surely, 2^21131301 is an apocalyptic number.

It is an amenable number.

21131301 is a deficient number, since it is larger than the sum of its proper divisors (7043771).

21131301 is an equidigital number, since it uses as much as digits as its factorization.

21131301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043770.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 21131301 is about 4596.8794850420. The cubic root of 21131301 is about 276.4662226146.

Adding to 21131301 its reverse (10313112), we get a palindrome (31444413).

The spelling of 21131301 in words is "twenty-one million, one hundred thirty-one thousand, three hundred one".