21242301 has 16 divisors (see below), whose sum is σ = 29483520. Its totient is φ = 13592880.

The previous prime is 21242237. The next prime is 21242339. The reversal of 21242301 is 10324212.

It is not a de Polignac number, because 21242301 - 2⁶ = 21242237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6216 + ... + 9006.

It is an arithmetic number, because the mean of its divisors is an integer number (1842720).

Almost surely, 2^21242301 is an apocalyptic number.

It is an amenable number.

21242301 is a deficient number, since it is larger than the sum of its proper divisors (8241219).

21242301 is a wasteful number, since it uses less digits than its factorization.

21242301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21242301 is about 4608.9370791973. The cubic root of 21242301 is about 276.9494579509.

Adding to 21242301 its reverse (10324212), we get a palindrome (31566513).

The spelling of 21242301 in words is "twenty-one million, two hundred forty-two thousand, three hundred one".