1251200302421 has 2 divisors, whose sum is σ = 1251200302422. Its totient is φ = 1251200302420.

The previous prime is 1251200302411. The next prime is 1251200302439. The reversal of 1251200302421 is 1242030021521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660010008100 + 591190294321 = 812410^2 + 768889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251200302421 - 2¹⁰ = 1251200301397 is a prime.

It is a super-2 number, since 2×1251200302421² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251200302411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625600151210 + 625600151211.

It is an arithmetic number, because the mean of its divisors is an integer number (625600151211).

Almost surely, 2^{1251200302421} is an apocalyptic number.

It is an amenable number.

1251200302421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251200302421 is an equidigital number, since it uses as much as digits as its factorization.

1251200302421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 1251200302421 its reverse (1242030021521), we get a palindrome (2493230323942).

The spelling of 1251200302421 in words is "one trillion, two hundred fifty-one billion, two hundred million, three hundred two thousand, four hundred twenty-one".