21230213211 has 16 divisors (see below), whose sum is σ = 31582684320. Its totient is φ = 14094743040.

The previous prime is 21230213201. The next prime is 21230213243. The reversal of 21230213211 is 11231203212.

21230213211 is a `hidden beast` number, since 212 + 30 + 213 + 211 = 666.

It is not a de Polignac number, because 21230213211 - 2⁹ = 21230212699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21230213201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1624830 + ... + 1637843.

It is an arithmetic number, because the mean of its divisors is an integer number (1973917770).

Almost surely, 2^21230213211 is an apocalyptic number.

21230213211 is a deficient number, since it is larger than the sum of its proper divisors (10352471109).

21230213211 is a wasteful number, since it uses less digits than its factorization.

21230213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262923 (or 3262917 counting only the distinct ones).

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

Adding to 21230213211 its reverse (11231203212), we get a palindrome (32461416423).

Subtracting from 21230213211 its reverse (11231203212), we obtain a palindrome (9999009999).

The spelling of 21230213211 in words is "twenty-one billion, two hundred thirty million, two hundred thirteen thousand, two hundred eleven".