21330212211 has 48 divisors (see below), whose sum is σ = 39737468160. Its totient is φ = 10698528960.

The previous prime is 21330212209. The next prime is 21330212227. The reversal of 21330212211 is 11221203312.

21330212211 is a `hidden beast` number, since 213 + 30 + 212 + 211 = 666.

It is not a de Polignac number, because 21330212211 - 2¹ = 21330212209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21330212261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 510585 + ... + 550778.

It is an arithmetic number, because the mean of its divisors is an integer number (827863920).

Almost surely, 2^21330212211 is an apocalyptic number.

21330212211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21330212211 is a deficient number, since it is larger than the sum of its proper divisors (18407255949).

21330212211 is a wasteful number, since it uses less digits than its factorization.

21330212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061416 (or 1061413 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21330212211 its reverse (11221203312), we get a palindrome (32551415523).

The spelling of 21330212211 in words is "twenty-one billion, three hundred thirty million, two hundred twelve thousand, two hundred eleven".