21252301 has 4 divisors (see below), whose sum is σ = 24288352. Its totient is φ = 18216252.

The previous prime is 21252293. The next prime is 21252323. The reversal of 21252301 is 10325212.

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 21252301 - 2³ = 21252293 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252001) 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, 1518015 + ... + 1518028.

It is an arithmetic number, because the mean of its divisors is an integer number (6072088).

Almost surely, 2^21252301 is an apocalyptic number.

It is an amenable number.

21252301 is a deficient number, since it is larger than the sum of its proper divisors (3036051).

21252301 is an equidigital number, since it uses as much as digits as its factorization.

21252301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036050.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21252301 is about 4610.0218003823. The cubic root of 21252301 is about 276.9929099307.

Adding to 21252301 its reverse (10325212), we get a palindrome (31577513).

The spelling of 21252301 in words is "twenty-one million, two hundred fifty-two thousand, three hundred one".