21023002209 has 8 divisors (see below), whose sum is σ = 30578912352. Its totient is φ = 12741213440.

The previous prime is 21023002153. The next prime is 21023002243. The reversal of 21023002209 is 90220032012.

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 21023002209 - 2¹¹ = 21023000161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023002249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318530304 + ... + 318530369.

It is an arithmetic number, because the mean of its divisors is an integer number (3822364044).

Almost surely, 2^21023002209 is an apocalyptic number.

It is an amenable number.

21023002209 is a deficient number, since it is larger than the sum of its proper divisors (9555910143).

21023002209 is a wasteful number, since it uses less digits than its factorization.

21023002209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637060687.

The product of its (nonzero) digits is 432, while the sum is 21.

The spelling of 21023002209 in words is "twenty-one billion, twenty-three million, two thousand, two hundred nine".