21201132133 has 4 divisors (see below), whose sum is σ = 21601153548. Its totient is φ = 20801110720.

The previous prime is 21201132107. The next prime is 21201132137. The reversal of 21201132133 is 33123110212.

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 17818779169 + 3382352964 = 133487^2 + 58158^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201132133 - 2⁵ = 21201132101 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 21201132133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201132137) 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, 200010628 + ... + 200010733.

It is an arithmetic number, because the mean of its divisors is an integer number (5400288387).

Almost surely, 2^21201132133 is an apocalyptic number.

It is an amenable number.

21201132133 is a deficient number, since it is larger than the sum of its proper divisors (400021415).

21201132133 is an equidigital number, since it uses as much as digits as its factorization.

21201132133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400021414.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21201132133 its reverse (33123110212), we get a palindrome (54324242345).

The spelling of 21201132133 in words is "twenty-one billion, two hundred one million, one hundred thirty-two thousand, one hundred thirty-three".