21001331133 has 12 divisors (see below), whose sum is σ = 31458784448. Its totient is φ = 14000887260.

The previous prime is 21001331077. The next prime is 21001331189. The reversal of 21001331133 is 33113310012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21001331077) and next prime (21001331189).

It is not a de Polignac number, because 21001331133 - 2⁶ = 21001331069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001331033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43212373 + ... + 43212858.

Almost surely, 2^21001331133 is an apocalyptic number.

It is an amenable number.

21001331133 is a deficient number, since it is larger than the sum of its proper divisors (10457453315).

21001331133 is an frugal number, since it uses more digits than its factorization.

21001331133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86425246 (or 86425234 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21001331133 its reverse (33113310012), we get a palindrome (54114641145).

The spelling of 21001331133 in words is "twenty-one billion, one million, three hundred thirty-one thousand, one hundred thirty-three".