21533134001 has 4 divisors (see below), whose sum is σ = 21734378352. Its totient is φ = 21331889652.

The previous prime is 21533133961. The next prime is 21533134009. The reversal of 21533134001 is 10043133512.

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 a de Polignac number, because none of the positive numbers 2^k-21533134001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21533134009) 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, 100622015 + ... + 100622228.

It is an arithmetic number, because the mean of its divisors is an integer number (5433594588).

Almost surely, 2^21533134001 is an apocalyptic number.

It is an amenable number.

21533134001 is a deficient number, since it is larger than the sum of its proper divisors (201244351).

21533134001 is a wasteful number, since it uses less digits than its factorization.

21533134001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201244350.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21533134001 its reverse (10043133512), we get a palindrome (31576267513).

The spelling of 21533134001 in words is "twenty-one billion, five hundred thirty-three million, one hundred thirty-four thousand, one".