2421023221 has 6 divisors (see below), whose sum is σ = 2429748866. Its totient is φ = 2412328800.

The previous prime is 2421023219. The next prime is 2421023233. The reversal of 2421023221 is 1223201242.

2421023221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1557486225 + 863536996 = 39465^2 + 29386^2 .

It is not a de Polignac number, because 2421023221 - 2¹ = 2421023219 is a prime.

It is a super-2 number, since 2×2421023221² = 11722706873242429682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421023321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63631 + ... + 94291.

Almost surely, 2^2421023221 is an apocalyptic number.

It is an amenable number.

2421023221 is a deficient number, since it is larger than the sum of its proper divisors (8725645).

2421023221 is an frugal number, since it uses more digits than its factorization.

2421023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31223 (or 30942 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2421023221 is about 49203.8943682307. The cubic root of 2421023221 is about 1342.7638841026.

Adding to 2421023221 its reverse (1223201242), we get a palindrome (3644224463).

The spelling of 2421023221 in words is "two billion, four hundred twenty-one million, twenty-three thousand, two hundred twenty-one".