21133320209 has 16 divisors (see below), whose sum is σ = 22779905280. Its totient is φ = 19540861200.

The previous prime is 21133320179. The next prime is 21133320227. The reversal of 21133320209 is 90202333112.

It is a cyclic number.

It is not a de Polignac number, because 21133320209 - 2¹⁶ = 21133254673 is a prime.

It is a super-2 number, since 2×21133320209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133320709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176554 + ... + 1194380.

It is an arithmetic number, because the mean of its divisors is an integer number (1423744080).

Almost surely, 2^21133320209 is an apocalyptic number.

It is an amenable number.

21133320209 is a deficient number, since it is larger than the sum of its proper divisors (1646585071).

21133320209 is a wasteful number, since it uses less digits than its factorization.

21133320209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19340.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 21133320209 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty thousand, two hundred nine".