1001001021157 has 2 divisors, whose sum is σ = 1001001021158. Its totient is φ = 1001001021156.

The previous prime is 1001001021071. The next prime is 1001001021199. The reversal of 1001001021157 is 7511201001001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815275361476 + 185725659681 = 902926^2 + 430959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001001021157 - 2³¹ = 998853537509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001001021257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500500510578 + 500500510579.

It is an arithmetic number, because the mean of its divisors is an integer number (500500510579).

Almost surely, 2^{1001001021157} is an apocalyptic number.

It is an amenable number.

1001001021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001001021157 is an equidigital number, since it uses as much as digits as its factorization.

1001001021157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 19.

Adding to 1001001021157 its reverse (7511201001001), we get a palindrome (8512202022158).

The spelling of 1001001021157 in words is "one trillion, one billion, one million, twenty-one thousand, one hundred fifty-seven".