2101101020191 has 4 divisors (see below), whose sum is σ = 2101170240832. Its totient is φ = 2101031799552.

The previous prime is 2101101020147. The next prime is 2101101020219. The reversal of 2101101020191 is 1910201011012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101101020191 - 2⁹ = 2101101019679 is a prime.

It is a super-5 number, since 5×2101101020191⁵ (a number of 63 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101101020111) 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, 34564770 + ... + 34625503.

It is an arithmetic number, because the mean of its divisors is an integer number (525292560208).

Almost surely, 2^{2101101020191} is an apocalyptic number.

2101101020191 is a deficient number, since it is larger than the sum of its proper divisors (69220641).

2101101020191 is an equidigital number, since it uses as much as digits as its factorization.

2101101020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69220640.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 2101101020191 in words is "two trillion, one hundred one billion, one hundred one million, twenty thousand, one hundred ninety-one".