2351242221 has 4 divisors (see below), whose sum is σ = 3134989632. Its totient is φ = 1567494812.

The previous prime is 2351242199. The next prime is 2351242241. The reversal of 2351242221 is 1222421532.

2351242221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 2351242221 - 2⁹ = 2351241709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2351242191 and 2351242200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2351242241) 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, 391873701 + ... + 391873706.

It is an arithmetic number, because the mean of its divisors is an integer number (783747408).

Almost surely, 2^2351242221 is an apocalyptic number.

It is an amenable number.

2351242221 is a deficient number, since it is larger than the sum of its proper divisors (783747411).

2351242221 is an equidigital number, since it uses as much as digits as its factorization.

2351242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783747410.

The product of its digits is 1920, while the sum is 24.

The square root of 2351242221 is about 48489.6094127391. The cubic root of 2351242221 is about 1329.7371144542.

Adding to 2351242221 its reverse (1222421532), we get a palindrome (3573663753).

The spelling of 2351242221 in words is "two billion, three hundred fifty-one million, two hundred forty-two thousand, two hundred twenty-one".