21105016033 has 8 divisors (see below), whose sum is σ = 21155214528. Its totient is φ = 21054872784.

The previous prime is 21105016021. The next prime is 21105016063. The reversal of 21105016033 is 33061050112.

It is a happy number.

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 21105016033 - 2⁵ = 21105016001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21105015995 and 21105016013.

It is not an unprimeable number, because it can be changed into a prime (21105016003) 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, 808260 + ... + 833962.

It is an arithmetic number, because the mean of its divisors is an integer number (2644401816).

Almost surely, 2^21105016033 is an apocalyptic number.

It is an amenable number.

21105016033 is a deficient number, since it is larger than the sum of its proper divisors (50198495).

21105016033 is a wasteful number, since it uses less digits than its factorization.

21105016033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27623.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21105016033 its reverse (33061050112), we get a palindrome (54166066145).

The spelling of 21105016033 in words is "twenty-one billion, one hundred five million, sixteen thousand, thirty-three".