21535206616133 has 8 divisors (see below), whose sum is σ = 24611852314752. Its totient is φ = 18458607820176.

The previous prime is 21535206616123. The next prime is 21535206616229. The reversal of 21535206616133 is 33161660253512.

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 21535206616133 - 2¹⁸ = 21535206353989 is a prime.

It is a super-3 number, since 3×21535206616133³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535206616123) 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, 10736210 + ... + 12583187.

It is an arithmetic number, because the mean of its divisors is an integer number (3076481539344).

Almost surely, 2^{21535206616133} is an apocalyptic number.

It is an amenable number.

21535206616133 is a deficient number, since it is larger than the sum of its proper divisors (3076645698619).

21535206616133 is a wasteful number, since it uses less digits than its factorization.

21535206616133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23451331.

The product of its (nonzero) digits is 583200, while the sum is 44.

Adding to 21535206616133 its reverse (33161660253512), we get a palindrome (54696866869645).

The spelling of 21535206616133 in words is "twenty-one trillion, five hundred thirty-five billion, two hundred six million, six hundred sixteen thousand, one hundred thirty-three".