21300211 has 4 divisors (see below), whose sum is σ = 21441424. Its totient is φ = 21159000.

The previous prime is 21300203. The next prime is 21300233. The reversal of 21300211 is 11200312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21300211 - 2³ = 21300203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27300211) 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, 70380 + ... + 70681.

It is an arithmetic number, because the mean of its divisors is an integer number (5360356).

Almost surely, 2^21300211 is an apocalyptic number.

21300211 is a deficient number, since it is larger than the sum of its proper divisors (141213).

21300211 is a wasteful number, since it uses less digits than its factorization.

21300211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141212.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21300211 is about 4615.2151629149. The cubic root of 21300211 is about 277.2008994957.

Adding to 21300211 its reverse (11200312), we get a palindrome (32500523).

The spelling of 21300211 in words is "twenty-one million, three hundred thousand, two hundred eleven".