2406644221 has 4 divisors (see below), whose sum is σ = 2442564352. Its totient is φ = 2370724092.

The previous prime is 2406644213. The next prime is 2406644263. The reversal of 2406644221 is 1224466042.

It is a happy number.

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 not a de Polignac number, because 2406644221 - 2³ = 2406644213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406644521) 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, 17959965 + ... + 17960098.

It is an arithmetic number, because the mean of its divisors is an integer number (610641088).

Almost surely, 2^2406644221 is an apocalyptic number.

It is an amenable number.

2406644221 is a deficient number, since it is larger than the sum of its proper divisors (35920131).

2406644221 is an equidigital number, since it uses as much as digits as its factorization.

2406644221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35920130.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 2406644221 is about 49057.5602838135. The cubic root of 2406644221 is about 1340.1002785651.

The spelling of 2406644221 in words is "two billion, four hundred six million, six hundred forty-four thousand, two hundred twenty-one".