21004134133 has 4 divisors (see below), whose sum is σ = 21200434560. Its totient is φ = 20807833708.

The previous prime is 21004134121. The next prime is 21004134139. The reversal of 21004134133 is 33143140012.

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-21004134133 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 (21004134139) 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, 98150053 + ... + 98150266.

It is an arithmetic number, because the mean of its divisors is an integer number (5300108640).

Almost surely, 2^21004134133 is an apocalyptic number.

It is an amenable number.

21004134133 is a deficient number, since it is larger than the sum of its proper divisors (196300427).

21004134133 is a wasteful number, since it uses less digits than its factorization.

21004134133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196300426.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21004134133 its reverse (33143140012), we get a palindrome (54147274145).

The spelling of 21004134133 in words is "twenty-one billion, four million, one hundred thirty-four thousand, one hundred thirty-three".