2205421 has 8 divisors (see below), whose sum is σ = 2305080. Its totient is φ = 2107392.

The previous prime is 2205409. The next prime is 2205449. The reversal of 2205421 is 1245022.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 2205225 = 14^2 + 1485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(2205421) divides (2205421-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 2205421 - 2⁵ = 2205389 is a prime.

It is a Duffinian number.

2205421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2205395 and 2205404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205451) 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, 2941 + ... + 3613.

It is an arithmetic number, because the mean of its divisors is an integer number (288135).

2^2205421 is an apocalyptic number.

It is an amenable number.

2205421 is a deficient number, since it is larger than the sum of its proper divisors (99659).

2205421 is a wasteful number, since it uses less digits than its factorization.

2205421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2205421 is about 1485.0659917997. The cubic root of 2205421 is about 130.1658829142.

The spelling of 2205421 in words is "two million, two hundred five thousand, four hundred twenty-one".