21120122202209 has 4 divisors (see below), whose sum is σ = 21120132202260. Its totient is φ = 21120112202160.

The previous prime is 21120122202181. The next prime is 21120122202253. The reversal of 21120122202209 is 90220222102112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13834144647184 + 7285977555025 = 3719428^2 + 2699255^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120122202209 - 2²⁰ = 21120121153633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120122702209) 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, 454694 + ... + 6515135.

It is an arithmetic number, because the mean of its divisors is an integer number (5280033050565).

Almost surely, 2^{21120122202209} is an apocalyptic number.

It is an amenable number.

21120122202209 is a deficient number, since it is larger than the sum of its proper divisors (10000051).

21120122202209 is an equidigital number, since it uses as much as digits as its factorization.

21120122202209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000050.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 21120122202209 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, two hundred two thousand, two hundred nine".