21361301 has 16 divisors (see below), whose sum is σ = 24393600. Its totient is φ = 18543168.

The previous prime is 21361283. The next prime is 21361303. The reversal of 21361301 is 10316312.

It is a cyclic number.

It is not a de Polignac number, because 21361301 - 2⁶ = 21361237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21361301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361303) 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 15 ways as a sum of consecutive naturals, for example, 48440 + ... + 48878.

It is an arithmetic number, because the mean of its divisors is an integer number (1524600).

Almost surely, 2^21361301 is an apocalyptic number.

It is an amenable number.

21361301 is a deficient number, since it is larger than the sum of its proper divisors (3032299).

21361301 is a wasteful number, since it uses less digits than its factorization.

21361301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21361301 is about 4621.8287506138. The cubic root of 21361301 is about 277.4656549221.

Adding to 21361301 its reverse (10316312), we get a palindrome (31677613).

The spelling of 21361301 in words is "twenty-one million, three hundred sixty-one thousand, three hundred one".