1000020221197 has 2 divisors, whose sum is σ = 1000020221198. Its totient is φ = 1000020221196.

The previous prime is 1000020221183. The next prime is 1000020221269. The reversal of 1000020221197 is 7911220200001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611877515076 + 388142706121 = 782226^2 + 623011^2 .

It is an emirp because it is prime and its reverse (7911220200001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000020221197 - 2²⁷ = 999886003469 is a prime.

It is a super-2 number, since 2×1000020221197² (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 (1000020221177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010110598 + 500010110599.

It is an arithmetic number, because the mean of its divisors is an integer number (500010110599).

Almost surely, 2^{1000020221197} is an apocalyptic number.

It is an amenable number.

1000020221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000020221197 is an equidigital number, since it uses as much as digits as its factorization.

1000020221197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 1000020221197 its reverse (7911220200001), we get a palindrome (8911240421198).

The spelling of 1000020221197 in words is "one trillion, twenty million, two hundred twenty-one thousand, one hundred ninety-seven".