20201000122191 has 16 divisors (see below), whose sum is σ = 30789640227584. Its totient is φ = 11540742197184.

The previous prime is 20201000122187. The next prime is 20201000122201. The reversal of 20201000122191 is 19122100010202.

It is not a de Polignac number, because 20201000122191 - 2² = 20201000122187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201000122591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111842785 + ... + 112023258.

It is an arithmetic number, because the mean of its divisors is an integer number (1924352514224).

Almost surely, 2^{20201000122191} is an apocalyptic number.

20201000122191 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20201000122191 is a deficient number, since it is larger than the sum of its proper divisors (10588640105393).

20201000122191 is a wasteful number, since it uses less digits than its factorization.

20201000122191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223870350.

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

Adding to 20201000122191 its reverse (19122100010202), we get a palindrome (39323100132393).

The spelling of 20201000122191 in words is "twenty trillion, two hundred one billion, one hundred twenty-two thousand, one hundred ninety-one".