122521209 has 4 divisors (see below), whose sum is σ = 163361616. Its totient is φ = 81680804.

The previous prime is 122521187. The next prime is 122521219. The reversal of 122521209 is 902125221.

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 not a de Polignac number, because 122521209 - 2⁷ = 122521081 is a prime.

It is a super-2 number, since 2×122521209² = 30022893309643362, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122521219) 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, 20420199 + ... + 20420204.

It is an arithmetic number, because the mean of its divisors is an integer number (40840404).

Almost surely, 2^122521209 is an apocalyptic number.

It is an amenable number.

122521209 is a deficient number, since it is larger than the sum of its proper divisors (40840407).

122521209 is an equidigital number, since it uses as much as digits as its factorization.

122521209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40840406.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 122521209 is about 11068.9298940774. The cubic root of 122521209 is about 496.6728546492.

The spelling of 122521209 in words is "one hundred twenty-two million, five hundred twenty-one thousand, two hundred nine".