21336400211 has 12 divisors (see below), whose sum is σ = 24914281392. Its totient is φ = 18218794608.

The previous prime is 21336400201. The next prime is 21336400223. The reversal of 21336400211 is 11200463312.

It is not a de Polignac number, because 21336400211 - 2¹⁸ = 21336138067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21336400201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814940 + ... + 840713.

It is an arithmetic number, because the mean of its divisors is an integer number (2076190116).

Almost surely, 2^21336400211 is an apocalyptic number.

21336400211 is a deficient number, since it is larger than the sum of its proper divisors (3577881181).

21336400211 is a wasteful number, since it uses less digits than its factorization.

21336400211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655930 (or 1655923 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21336400211 its reverse (11200463312), we get a palindrome (32536863523).

The spelling of 21336400211 in words is "twenty-one billion, three hundred thirty-six million, four hundred thousand, two hundred eleven".