1010000221991 has 2 divisors, whose sum is σ = 1010000221992. Its totient is φ = 1010000221990.

The previous prime is 1010000221957. The next prime is 1010000222009. The reversal of 1010000221991 is 1991220000101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1010000221991 - 2³⁸ = 735122315047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1010000221991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010000281991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505000110995 + 505000110996.

It is an arithmetic number, because the mean of its divisors is an integer number (505000110996).

Almost surely, 2^{1010000221991} is an apocalyptic number.

1010000221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010000221991 is an equidigital number, since it uses as much as digits as its factorization.

1010000221991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 1010000221991 in words is "one trillion, ten billion, two hundred twenty-one thousand, nine hundred ninety-one".