10221099991 has 2 divisors, whose sum is σ = 10221099992. Its totient is φ = 10221099990.

The previous prime is 10221099983. The next prime is 10221100013. The reversal of 10221099991 is 19999012201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10221099991 - 2³ = 10221099983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221099971) 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, 5110549995 + 5110549996.

It is an arithmetic number, because the mean of its divisors is an integer number (5110549996).

Almost surely, 2^10221099991 is an apocalyptic number.

10221099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221099991 is an equidigital number, since it uses as much as digits as its factorization.

10221099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 10221099991 in words is "ten billion, two hundred twenty-one million, ninety-nine thousand, nine hundred ninety-one".