2421221309 has 32 divisors (see below), whose sum is σ = 2728427520. Its totient is φ = 2134372032.

The previous prime is 2421221279. The next prime is 2421221317. The reversal of 2421221309 is 9031221242.

2421221309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2421221309 - 2¹⁶ = 2421155773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421221329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4971464 + ... + 4971950.

It is an arithmetic number, because the mean of its divisors is an integer number (85263360).

Almost surely, 2^2421221309 is an apocalyptic number.

It is an amenable number.

2421221309 is a deficient number, since it is larger than the sum of its proper divisors (307206211).

2421221309 is a wasteful number, since it uses less digits than its factorization.

2421221309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2421221309 is about 49205.9072571577. The cubic root of 2421221309 is about 1342.8005047287.

The spelling of 2421221309 in words is "two billion, four hundred twenty-one million, two hundred twenty-one thousand, three hundred nine".