2401212221 has 2 divisors, whose sum is σ = 2401212222. Its totient is φ = 2401212220.

The previous prime is 2401212217. The next prime is 2401212271. The reversal of 2401212221 is 1222121042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865289721 + 535922500 = 43189^2 + 23150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2401212221 - 2² = 2401212217 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 2401212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2401212211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1200606110 + 1200606111.

It is an arithmetic number, because the mean of its divisors is an integer number (1200606111).

Almost surely, 2^2401212221 is an apocalyptic number.

It is an amenable number.

2401212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2401212221 is an equidigital number, since it uses as much as digits as its factorization.

2401212221 is an evil number, because the sum of its binary digits is even.

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

The square root of 2401212221 is about 49002.1654725585. The cubic root of 2401212221 is about 1339.0912790785.

Adding to 2401212221 its reverse (1222121042), we get a palindrome (3623333263).

The spelling of 2401212221 in words is "two billion, four hundred one million, two hundred twelve thousand, two hundred twenty-one".