21135514033 has 4 divisors (see below), whose sum is σ = 21706744180. Its totient is φ = 20564283888.

The previous prime is 21135514031. The next prime is 21135514073. The reversal of 21135514033 is 33041553112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20230226289 + 905287744 = 142233^2 + 30088^2 .

It is a cyclic number.

It is not a de Polignac number, because 21135514033 - 2¹ = 21135514031 is a prime.

It is a super-3 number, since 3×21135514033³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21135513992 and 21135514010.

It is not an unprimeable number, because it can be changed into a prime (21135514031) 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 3 ways as a sum of consecutive naturals, for example, 285615018 + ... + 285615091.

It is an arithmetic number, because the mean of its divisors is an integer number (5426686045).

Almost surely, 2^21135514033 is an apocalyptic number.

It is an amenable number.

21135514033 is a deficient number, since it is larger than the sum of its proper divisors (571230147).

21135514033 is an equidigital number, since it uses as much as digits as its factorization.

21135514033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571230146.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 21135514033 in words is "twenty-one billion, one hundred thirty-five million, five hundred fourteen thousand, thirty-three".