1252708021 has 2 divisors, whose sum is σ = 1252708022. Its totient is φ = 1252708020.

The previous prime is 1252708007. The next prime is 1252708027. The reversal of 1252708021 is 1208072521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018311921 + 234396100 = 31911^2 + 15310^2 .

It is an emirp because it is prime and its reverse (1208072521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1252708021 - 2¹¹ = 1252705973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252708027) 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, 626354010 + 626354011.

It is an arithmetic number, because the mean of its divisors is an integer number (626354011).

Almost surely, 2^1252708021 is an apocalyptic number.

It is an amenable number.

1252708021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252708021 is an equidigital number, since it uses as much as digits as its factorization.

1252708021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 1252708021 is about 35393.6155400942. The cubic root of 1252708021 is about 1077.9946845233.

The spelling of 1252708021 in words is "one billion, two hundred fifty-two million, seven hundred eight thousand, twenty-one".