20356635321133 has 4 divisors (see below), whose sum is σ = 21428037180160. Its totient is φ = 19285233462108.

The previous prime is 20356635321101. The next prime is 20356635321149. The reversal of 20356635321133 is 33112353665302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20356635321133 - 2⁵ = 20356635321101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20356635321133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356635321193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535700929485 + ... + 535700929522.

It is an arithmetic number, because the mean of its divisors is an integer number (5357009295040).

Almost surely, 2^{20356635321133} is an apocalyptic number.

It is an amenable number.

20356635321133 is a deficient number, since it is larger than the sum of its proper divisors (1071401859027).

20356635321133 is a wasteful number, since it uses less digits than its factorization.

20356635321133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071401859026.

The product of its (nonzero) digits is 874800, while the sum is 43.

Adding to 20356635321133 its reverse (33112353665302), we get a palindrome (53468988986435).

The spelling of 20356635321133 in words is "twenty trillion, three hundred fifty-six billion, six hundred thirty-five million, three hundred twenty-one thousand, one hundred thirty-three".