21406010211 has 12 divisors (see below), whose sum is σ = 32064970392. Its totient is φ = 14270673312.

The previous prime is 21406010191. The next prime is 21406010221. The reversal of 21406010211 is 11201060412.

21406010211 is a `hidden beast` number, since 2 + 1 + 40 + 601 + 0 + 21 + 1 = 666.

It is not a de Polignac number, because 21406010211 - 2⁹ = 21406009699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21406010221) 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, 44045046 + ... + 44045531.

It is an arithmetic number, because the mean of its divisors is an integer number (2672080866).

Almost surely, 2^21406010211 is an apocalyptic number.

21406010211 is a deficient number, since it is larger than the sum of its proper divisors (10658960181).

21406010211 is an frugal number, since it uses more digits than its factorization.

21406010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88090592 (or 88090580 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21406010211 its reverse (11201060412), we get a palindrome (32607070623).

The spelling of 21406010211 in words is "twenty-one billion, four hundred six million, ten thousand, two hundred eleven".