2151250121 has 2 divisors, whose sum is σ = 2151250122. Its totient is φ = 2151250120.

The previous prime is 2151250117. The next prime is 2151250141. The reversal of 2151250121 is 1210521512.

It is an a-pointer prime, because the next prime (2151250141) can be obtained adding 2151250121 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1962490000 + 188760121 = 44300^2 + 13739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151250121 - 2² = 2151250117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151250093 and 2151250102.

It is not a weakly prime, because it can be changed into another prime (2151250141) 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 as a sum of consecutive naturals, namely, 1075625060 + 1075625061.

It is an arithmetic number, because the mean of its divisors is an integer number (1075625061).

Almost surely, 2^2151250121 is an apocalyptic number.

It is an amenable number.

2151250121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151250121 is an equidigital number, since it uses as much as digits as its factorization.

2151250121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2151250121 is about 46381.5709199247. The cubic root of 2151250121 is about 1290.9129848835.

Adding to 2151250121 its reverse (1210521512), we get a palindrome (3361771633).

The spelling of 2151250121 in words is "two billion, one hundred fifty-one million, two hundred fifty thousand, one hundred twenty-one".