21233423211 has 256 divisors, whose sum is σ = 41184460800. Its totient is φ = 9380966400.

The previous prime is 21233423171. The next prime is 21233423219. The reversal of 21233423211 is 11232433212.

It is not a de Polignac number, because 21233423211 - 2¹⁵ = 21233390443 is a prime.

It is a super-2 number, since 2×21233423211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21233423219) 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 255 ways as a sum of consecutive naturals, for example, 268777470 + ... + 268777548.

It is an arithmetic number, because the mean of its divisors is an integer number (160876800).

Almost surely, 2^21233423211 is an apocalyptic number.

21233423211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21233423211 is a deficient number, since it is larger than the sum of its proper divisors (19951037589).

21233423211 is a wasteful number, since it uses less digits than its factorization.

21233423211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its digits is 1728, while the sum is 24.

Adding to 21233423211 its reverse (11232433212), we get a palindrome (32465856423).

It can be divided in two parts, 21233 and 423211, that added together give a palindrome (444444).

The spelling of 21233423211 in words is "twenty-one billion, two hundred thirty-three million, four hundred twenty-three thousand, two hundred eleven".