1001200221181 has 2 divisors, whose sum is σ = 1001200221182. Its totient is φ = 1001200221180.

The previous prime is 1001200221127. The next prime is 1001200221193. The reversal of 1001200221181 is 1811220021001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948999395556 + 52200825625 = 974166^2 + 228475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001200221181 - 2¹⁵ = 1001200188413 is a prime.

It is a super-2 number, since 2×1001200221181² (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 (1001200222181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500600110590 + 500600110591.

It is an arithmetic number, because the mean of its divisors is an integer number (500600110591).

Almost surely, 2^{1001200221181} is an apocalyptic number.

It is an amenable number.

1001200221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001200221181 is an equidigital number, since it uses as much as digits as its factorization.

1001200221181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1001200221181 its reverse (1811220021001), we get a palindrome (2812420242182).

The spelling of 1001200221181 in words is "one trillion, one billion, two hundred million, two hundred twenty-one thousand, one hundred eighty-one".