21240120033 has 12 divisors (see below), whose sum is σ = 33469280208. Its totient is φ = 12872799960.

The previous prime is 21240120019. The next prime is 21240120037. The reversal of 21240120033 is 33002104212.

21240120033 is a `hidden beast` number, since 212 + 401 + 20 + 0 + 33 = 666.

It is not a de Polignac number, because 21240120033 - 2⁹ = 21240119521 is a prime.

It is a super-2 number, since 2×21240120033² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21240119988 and 21240120015.

It is not an unprimeable number, because it can be changed into a prime (21240120037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107273235 + ... + 107273432.

It is an arithmetic number, because the mean of its divisors is an integer number (2789106684).

Almost surely, 2^21240120033 is an apocalyptic number.

It is an amenable number.

21240120033 is a deficient number, since it is larger than the sum of its proper divisors (12229160175).

21240120033 is a wasteful number, since it uses less digits than its factorization.

21240120033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214546684 (or 214546681 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21240120033 its reverse (33002104212), we get a palindrome (54242224245).

The spelling of 21240120033 in words is "twenty-one billion, two hundred forty million, one hundred twenty thousand, thirty-three".