1280531150021 has 2 divisors, whose sum is σ = 1280531150022. Its totient is φ = 1280531150020.

The previous prime is 1280531150011. The next prime is 1280531150027. The reversal of 1280531150021 is 1200511350821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846006285796 + 434524864225 = 919786^2 + 659185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280531150021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280531150027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640265575010 + 640265575011.

It is an arithmetic number, because the mean of its divisors is an integer number (640265575011).

Almost surely, 2^{1280531150021} is an apocalyptic number.

It is an amenable number.

1280531150021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280531150021 is an equidigital number, since it uses as much as digits as its factorization.

1280531150021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 29.

The spelling of 1280531150021 in words is "one trillion, two hundred eighty billion, five hundred thirty-one million, one hundred fifty thousand, twenty-one".