1000022200861 has 2 divisors, whose sum is σ = 1000022200862. Its totient is φ = 1000022200860.

The previous prime is 1000022200823. The next prime is 1000022200883. The reversal of 1000022200861 is 1680022200001.

It is an a-pointer prime, because the next prime (1000022200883) can be obtained adding 1000022200861 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571998765636 + 428023435225 = 756306^2 + 654235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000022200861 - 2¹⁹ = 1000021676573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000022200061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500011100430 + 500011100431.

It is an arithmetic number, because the mean of its divisors is an integer number (500011100431).

Almost surely, 2^{1000022200861} is an apocalyptic number.

It is an amenable number.

1000022200861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000022200861 is an equidigital number, since it uses as much as digits as its factorization.

1000022200861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 1000022200861 its reverse (1680022200001), we get a palindrome (2680044400862).

The spelling of 1000022200861 in words is "one trillion, twenty-two million, two hundred thousand, eight hundred sixty-one".