21133331309 has 8 divisors (see below), whose sum is σ = 21585020160. Its totient is φ = 20681727696.

The previous prime is 21133331299. The next prime is 21133331311. The reversal of 21133331309 is 90313333112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21133331309 - 2⁸ = 21133331053 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 (21133321309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 901592 + ... + 924734.

It is an arithmetic number, because the mean of its divisors is an integer number (2698127520).

Almost surely, 2^21133331309 is an apocalyptic number.

It is an amenable number.

21133331309 is a deficient number, since it is larger than the sum of its proper divisors (451688851).

21133331309 is a wasteful number, since it uses less digits than its factorization.

21133331309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42619.

The product of its (nonzero) digits is 4374, while the sum is 29.

The spelling of 21133331309 in words is "twenty-one billion, one hundred thirty-three million, three hundred thirty-one thousand, three hundred nine".