2420211221 has 4 divisors (see below), whose sum is σ = 2420521344. Its totient is φ = 2419901100.

The previous prime is 2420211169. The next prime is 2420211223. The reversal of 2420211221 is 1221120242.

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 a de Polignac number, because none of the positive numbers 2^k-2420211221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2420211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2420211223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143045 + ... + 159066.

It is an arithmetic number, because the mean of its divisors is an integer number (605130336).

Almost surely, 2^2420211221 is an apocalyptic number.

It is an amenable number.

2420211221 is a deficient number, since it is larger than the sum of its proper divisors (310123).

2420211221 is an equidigital number, since it uses as much as digits as its factorization.

2420211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310122.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2420211221 is about 49195.6422968539. The cubic root of 2420211221 is about 1342.6137483827.

Adding to 2420211221 its reverse (1221120242), we get a palindrome (3641331463).

The spelling of 2420211221 in words is "two billion, four hundred twenty million, two hundred eleven thousand, two hundred twenty-one".