21317301 has 6 divisors (see below), whose sum is σ = 30791670. Its totient is φ = 14211528.

The previous prime is 21317267. The next prime is 21317327. The reversal of 21317301 is 10371312.

It can be written as a sum of positive squares in only one way, i.e., 14814801 + 6502500 = 3849^2 + 2550^2 .

It is not a de Polignac number, because 21317301 - 2¹⁰ = 21316277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1184286 + ... + 1184303.

It is an arithmetic number, because the mean of its divisors is an integer number (5131945).

Almost surely, 2^21317301 is an apocalyptic number.

It is an amenable number.

21317301 is a deficient number, since it is larger than the sum of its proper divisors (9474369).

21317301 is a wasteful number, since it uses less digits than its factorization.

21317301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368595 (or 2368592 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 21317301 is about 4617.0662763274. The cubic root of 21317301 is about 277.2750160846.

Adding to 21317301 its reverse (10371312), we get a palindrome (31688613).

The spelling of 21317301 in words is "twenty-one million, three hundred seventeen thousand, three hundred one".