101999991000221 has 4 divisors (see below), whose sum is σ = 107368411579200. Its totient is φ = 96631570421244.

The previous prime is 101999991000077. The next prime is 101999991000227. The reversal of 101999991000221 is 122000199999101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101999991000221 - 2³⁸ = 101725113093277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101999991000227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2684210289461 + ... + 2684210289498.

It is an arithmetic number, because the mean of its divisors is an integer number (26842102894800).

Almost surely, 2^{101999991000221} is an apocalyptic number.

It is an amenable number.

101999991000221 is a deficient number, since it is larger than the sum of its proper divisors (5368420578979).

101999991000221 is an equidigital number, since it uses as much as digits as its factorization.

101999991000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368420578978.

The product of its (nonzero) digits is 236196, while the sum is 53.

The spelling of 101999991000221 in words is "one hundred one trillion, nine hundred ninety-nine billion, nine hundred ninety-one million, two hundred twenty-one", and thus it is an aban number.