21293301 has 4 divisors (see below), whose sum is σ = 28391072. Its totient is φ = 14195532.

The previous prime is 21293273. The next prime is 21293317. The reversal of 21293301 is 10339212.

It is a happy number.

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 21293301 - 2¹⁰ = 21292277 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 (21293341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3548881 + ... + 3548886.

It is an arithmetic number, because the mean of its divisors is an integer number (7097768).

Almost surely, 2^21293301 is an apocalyptic number.

It is an amenable number.

21293301 is a deficient number, since it is larger than the sum of its proper divisors (7097771).

21293301 is an equidigital number, since it uses as much as digits as its factorization.

21293301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7097770.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21293301 is about 4614.4664913725. The cubic root of 21293301 is about 277.1709206787.

The spelling of 21293301 in words is "twenty-one million, two hundred ninety-three thousand, three hundred one".