2205120621 has 16 divisors (see below), whose sum is σ = 3221225280. Its totient is φ = 1330696320.

The previous prime is 2205120587. The next prime is 2205120623. The reversal of 2205120621 is 1260215022.

It is a happy number.

It is not a de Polignac number, because 2205120621 - 2⁶ = 2205120557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205120623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135706 + ... + 151083.

It is an arithmetic number, because the mean of its divisors is an integer number (201326580).

Almost surely, 2^2205120621 is an apocalyptic number.

It is an amenable number.

2205120621 is a deficient number, since it is larger than the sum of its proper divisors (1016104659).

2205120621 is a wasteful number, since it uses less digits than its factorization.

2205120621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287036.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2205120621 is about 46958.7118754337. The cubic root of 2205120621 is about 1301.5997310183.

Adding to 2205120621 its reverse (1260215022), we get a palindrome (3465335643).

The spelling of 2205120621 in words is "two billion, two hundred five million, one hundred twenty thousand, six hundred twenty-one".