1251036152021 has 2 divisors, whose sum is σ = 1251036152022. Its totient is φ = 1251036152020.

The previous prime is 1251036152017. The next prime is 1251036152083. The reversal of 1251036152021 is 1202516301521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1043452035025 + 207584116996 = 1021495^2 + 455614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251036152021 - 2² = 1251036152017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251036152621) 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, 625518076010 + 625518076011.

It is an arithmetic number, because the mean of its divisors is an integer number (625518076011).

Almost surely, 2^{1251036152021} is an apocalyptic number.

It is an amenable number.

1251036152021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251036152021 is an equidigital number, since it uses as much as digits as its factorization.

1251036152021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 1251036152021 in words is "one trillion, two hundred fifty-one billion, thirty-six million, one hundred fifty-two thousand, twenty-one".