20101202020191 has 4 divisors (see below), whose sum is σ = 26801602693592. Its totient is φ = 13400801346792.

The previous prime is 20101202020153. The next prime is 20101202020219. The reversal of 20101202020191 is 19102020210102.

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

It is not a de Polignac number, because 20101202020191 - 2³⁴ = 20084022151007 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 (20101202020091) 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 in 3 ways as a sum of consecutive naturals, for example, 3350200336696 + ... + 3350200336701.

It is an arithmetic number, because the mean of its divisors is an integer number (6700400673398).

Almost surely, 2^{20101202020191} is an apocalyptic number.

20101202020191 is a deficient number, since it is larger than the sum of its proper divisors (6700400673401).

20101202020191 is an equidigital number, since it uses as much as digits as its factorization.

20101202020191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700400673400.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 20101202020191 its reverse (19102020210102), we get a palindrome (39203222230293).

The spelling of 20101202020191 in words is "twenty trillion, one hundred one billion, two hundred two million, twenty thousand, one hundred ninety-one".