23211009 has 8 divisors (see below), whose sum is σ = 34386720. Its totient is φ = 15473988.

The previous prime is 23210987. The next prime is 23211029. The reversal of 23211009 is 90011232.

It is a happy number.

It is not a de Polignac number, because 23211009 - 2¹⁷ = 23079937 is a prime.

It is a super-5 number, since 5×23211009⁵ (a number of 38 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23210982 and 23211000.

It is not an unprimeable number, because it can be changed into a prime (23211029) 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, 429807 + ... + 429860.

It is an arithmetic number, because the mean of its divisors is an integer number (4298340).

Almost surely, 2^23211009 is an apocalyptic number.

It is an amenable number.

23211009 is a deficient number, since it is larger than the sum of its proper divisors (11175711).

23211009 is an equidigital number, since it uses as much as digits as its factorization.

23211009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859676 (or 859670 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 23211009 is about 4817.7805055855. The cubic root of 23211009 is about 285.2537352515.

The spelling of 23211009 in words is "twenty-three million, two hundred eleven thousand, nine".