21234120033 has 16 divisors (see below), whose sum is σ = 32499302400. Its totient is φ = 12080327376.

The previous prime is 21234120031. The next prime is 21234120043. The reversal of 21234120033 is 33002143212.

It is not a de Polignac number, because 21234120033 - 2¹ = 21234120031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21234119991 and 21234120009.

It is not an unprimeable number, because it can be changed into a prime (21234120031) 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, 2222433 + ... + 2231966.

It is an arithmetic number, because the mean of its divisors is an integer number (2031206400).

Almost surely, 2^21234120033 is an apocalyptic number.

It is an amenable number.

21234120033 is a deficient number, since it is larger than the sum of its proper divisors (11265182367).

21234120033 is a wasteful number, since it uses less digits than its factorization.

21234120033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454636.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21234120033 its reverse (33002143212), we get a palindrome (54236263245).

The spelling of 21234120033 in words is "twenty-one billion, two hundred thirty-four million, one hundred twenty thousand, thirty-three".