2051252221 has 2 divisors, whose sum is σ = 2051252222. Its totient is φ = 2051252220.

The previous prime is 2051252197. The next prime is 2051252227. The reversal of 2051252221 is 1222521502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2051184100 + 68121 = 45290^2 + 261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2051252221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2051252192 and 2051252201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051252227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025626110 + 1025626111.

It is an arithmetic number, because the mean of its divisors is an integer number (1025626111).

Almost surely, 2^2051252221 is an apocalyptic number.

It is an amenable number.

2051252221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051252221 is an equidigital number, since it uses as much as digits as its factorization.

2051252221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2051252221 is about 45290.7520471895. The cubic root of 2051252221 is about 1270.5926968769.

Adding to 2051252221 its reverse (1222521502), we get a palindrome (3273773723).

The spelling of 2051252221 in words is "two billion, fifty-one million, two hundred fifty-two thousand, two hundred twenty-one".