21224404102409 has 4 divisors (see below), whose sum is σ = 21224981030400. Its totient is φ = 21223827174420.

The previous prime is 21224404102361. The next prime is 21224404102459. The reversal of 21224404102409 is 90420140442212.

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 a de Polignac number, because none of the positive numbers 2^k-21224404102409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21224404102459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288408809 + ... + 288482390.

It is an arithmetic number, because the mean of its divisors is an integer number (5306245257600).

Almost surely, 2^{21224404102409} is an apocalyptic number.

It is an amenable number.

21224404102409 is a deficient number, since it is larger than the sum of its proper divisors (576927991).

21224404102409 is an equidigital number, since it uses as much as digits as its factorization.

21224404102409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576927990.

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 21224404102409 in words is "twenty-one trillion, two hundred twenty-four billion, four hundred four million, one hundred two thousand, four hundred nine".