21123442033 has 8 divisors (see below), whose sum is σ = 22363732800. Its totient is φ = 19896004368.

The previous prime is 21123442031. The next prime is 21123442057. The reversal of 21123442033 is 33024432112.

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 21123442033 - 2¹ = 21123442031 is a prime.

It is a super-2 number, since 2×21123442033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123441989 and 21123442007.

It is not an unprimeable number, because it can be changed into a prime (21123442031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3209893 + ... + 3216466.

It is an arithmetic number, because the mean of its divisors is an integer number (2795466600).

Almost surely, 2^21123442033 is an apocalyptic number.

It is an amenable number.

21123442033 is a deficient number, since it is larger than the sum of its proper divisors (1240290767).

21123442033 is a wasteful number, since it uses less digits than its factorization.

21123442033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6426551.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21123442033 its reverse (33024432112), we get a palindrome (54147874145).

The spelling of 21123442033 in words is "twenty-one billion, one hundred twenty-three million, four hundred forty-two thousand, thirty-three".