2402031221 has 4 divisors (see below), whose sum is σ = 2441408844. Its totient is φ = 2362653600.

The previous prime is 2402031217. The next prime is 2402031253. The reversal of 2402031221 is 1221302042.

2402031221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1401004900 + 1001026321 = 37430^2 + 31639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2402031221 - 2² = 2402031217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2402031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2402031721) 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, 19688720 + ... + 19688841.

It is an arithmetic number, because the mean of its divisors is an integer number (610352211).

Almost surely, 2^2402031221 is an apocalyptic number.

It is an amenable number.

2402031221 is a deficient number, since it is larger than the sum of its proper divisors (39377623).

2402031221 is an equidigital number, since it uses as much as digits as its factorization.

2402031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39377622.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2402031221 is about 49010.5215336462. The cubic root of 2402031221 is about 1339.2435065081.

Adding to 2402031221 its reverse (1221302042), we get a palindrome (3623333263).

The spelling of 2402031221 in words is "two billion, four hundred two million, thirty-one thousand, two hundred twenty-one".