1000221009971 has 2 divisors, whose sum is σ = 1000221009972. Its totient is φ = 1000221009970.

The previous prime is 1000221009967. The next prime is 1000221010057. The reversal of 1000221009971 is 1799001220001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000221009971 - 2² = 1000221009967 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000221006971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500110504985 + 500110504986.

It is an arithmetic number, because the mean of its divisors is an integer number (500110504986).

Almost surely, 2^{1000221009971} is an apocalyptic number.

1000221009971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000221009971 is an equidigital number, since it uses as much as digits as its factorization.

1000221009971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

Adding to 1000221009971 its reverse (1799001220001), we get a palindrome (2799222229972).

The spelling of 1000221009971 in words is "one trillion, two hundred twenty-one million, nine thousand, nine hundred seventy-one".