21300311 has 8 divisors (see below), whose sum is σ = 22484400. Its totient is φ = 20122560.

The previous prime is 21300289. The next prime is 21300319. The reversal of 21300311 is 11300312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21300311 - 2²² = 17106007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300292 and 21300301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6401 + ... + 9141.

It is an arithmetic number, because the mean of its divisors is an integer number (2810550).

Almost surely, 2^21300311 is an apocalyptic number.

21300311 is a deficient number, since it is larger than the sum of its proper divisors (1184089).

21300311 is a wasteful number, since it uses less digits than its factorization.

21300311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21300311 is about 4615.2259966333. The cubic root of 21300311 is about 277.2013332950.

Adding to 21300311 its reverse (11300312), we get a palindrome (32600623).

Subtracting from 21300311 its reverse (11300312), we obtain a palindrome (9999999).

The spelling of 21300311 in words is "twenty-one million, three hundred thousand, three hundred eleven".