1000100220991 has 2 divisors, whose sum is σ = 1000100220992. Its totient is φ = 1000100220990.

The previous prime is 1000100220913. The next prime is 1000100221007. The reversal of 1000100220991 is 1990220010001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000100220991 - 2²¹ = 1000098123839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000100220391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500050110495 + 500050110496.

It is an arithmetic number, because the mean of its divisors is an integer number (500050110496).

Almost surely, 2^{1000100220991} is an apocalyptic number.

1000100220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000100220991 is an equidigital number, since it uses as much as digits as its factorization.

1000100220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

Adding to 1000100220991 its reverse (1990220010001), we get a palindrome (2990320230992).

The spelling of 1000100220991 in words is "one trillion, one hundred million, two hundred twenty thousand, nine hundred ninety-one".