21122434233 has 20 divisors (see below), whose sum is σ = 31616057088. Its totient is φ = 14053600440.

The previous prime is 21122434117. The next prime is 21122434241. The reversal of 21122434233 is 33243422112.

21122434233 is a `hidden beast` number, since 2 + 11 + 224 + 3 + 423 + 3 = 666.

It is not a de Polignac number, because 21122434233 - 2⁸ = 21122433977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21122434197 and 21122434206.

It is not an unprimeable number, because it can be changed into a prime (21122434253) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 218473 + ... + 299958.

Almost surely, 2^21122434233 is an apocalyptic number.

It is an amenable number.

21122434233 is a deficient number, since it is larger than the sum of its proper divisors (10493622855).

21122434233 is an equidigital number, since it uses as much as digits as its factorization.

21122434233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518946 (or 518937 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21122434233 its reverse (33243422112), we get a palindrome (54365856345).

The spelling of 21122434233 in words is "twenty-one billion, one hundred twenty-two million, four hundred thirty-four thousand, two hundred thirty-three".