21123233211 has 8 divisors (see below), whose sum is σ = 28480764240. Its totient is φ = 13923928832.

The previous prime is 21123233203. The next prime is 21123233213. The reversal of 21123233211 is 11233232112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21123233211 - 2³ = 21123233203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123233213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39556350 + ... + 39556883.

It is an arithmetic number, because the mean of its divisors is an integer number (3560095530).

Almost surely, 2^21123233211 is an apocalyptic number.

21123233211 is a deficient number, since it is larger than the sum of its proper divisors (7357531029).

21123233211 is an equidigital number, since it uses as much as digits as its factorization.

21123233211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79113325.

The product of its digits is 432, while the sum is 21.

Adding to 21123233211 its reverse (11233232112), we get a palindrome (32356465323).

It can be divided in two parts, 2112 and 3233211, that added together give a palindrome (3235323).

The spelling of 21123233211 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-three thousand, two hundred eleven".