2805204121221 has 8 divisors (see below), whose sum is σ = 3740289060960. Its totient is φ = 1870127631152.

The previous prime is 2805204121201. The next prime is 2805204121241. The reversal of 2805204121221 is 1221214025082.

It is an interprime number because it is at equal distance from previous prime (2805204121201) and next prime (2805204121241).

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 2805204121221 - 2⁶ = 2805204121157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805204121201) 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, 1292286 + ... + 2698223.

It is an arithmetic number, because the mean of its divisors is an integer number (467536132620).

Almost surely, 2^{2805204121221} is an apocalyptic number.

It is an amenable number.

2805204121221 is a deficient number, since it is larger than the sum of its proper divisors (935084939739).

2805204121221 is a wasteful number, since it uses less digits than its factorization.

2805204121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224835.

The product of its (nonzero) digits is 5120, while the sum is 30.

The spelling of 2805204121221 in words is "two trillion, eight hundred five billion, two hundred four million, one hundred twenty-one thousand, two hundred twenty-one".