2400321221 has 2 divisors, whose sum is σ = 2400321222. Its totient is φ = 2400321220.

The previous prime is 2400321191. The next prime is 2400321229. The reversal of 2400321221 is 1221230042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2370618721 + 29702500 = 48689^2 + 5450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2400321221 is a prime.

It is a Sophie Germain prime.

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 2400321221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2400321229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1200160610 + 1200160611.

It is an arithmetic number, because the mean of its divisors is an integer number (1200160611).

Almost surely, 2^2400321221 is an apocalyptic number.

It is an amenable number.

2400321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2400321221 is an equidigital number, since it uses as much as digits as its factorization.

2400321221 is an evil number, because the sum of its binary digits is even.

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

The square root of 2400321221 is about 48993.0731940751. The cubic root of 2400321221 is about 1338.9256297001.

Adding to 2400321221 its reverse (1221230042), we get a palindrome (3621551263).

The spelling of 2400321221 in words is "two billion, four hundred million, three hundred twenty-one thousand, two hundred twenty-one".