2124221251 has 2 divisors, whose sum is σ = 2124221252. Its totient is φ = 2124221250.

The previous prime is 2124221237. The next prime is 2124221273. The reversal of 2124221251 is 1521224212.

It is an a-pointer prime, because the next prime (2124221273) can be obtained adding 2124221251 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2124221251 - 2⁵ = 2124221219 is a prime.

It is not a weakly prime, because it can be changed into another prime (2124221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062110625 + 1062110626.

It is an arithmetic number, because the mean of its divisors is an integer number (1062110626).

Almost surely, 2^2124221251 is an apocalyptic number.

2124221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2124221251 is an equidigital number, since it uses as much as digits as its factorization.

2124221251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 22.

The square root of 2124221251 is about 46089.2747936003. The cubic root of 2124221251 is about 1285.4837264960.

Adding to 2124221251 its reverse (1521224212), we get a palindrome (3645445463).

The spelling of 2124221251 in words is "two billion, one hundred twenty-four million, two hundred twenty-one thousand, two hundred fifty-one".