20122120191 has 8 divisors (see below), whose sum is σ = 26843917744. Its totient is φ = 13407534720.

The previous prime is 20122120129. The next prime is 20122120217. The reversal of 20122120191 is 19102122102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20122120191 - 2¹⁰ = 20122119167 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 (20122120111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1796506 + ... + 1807671.

It is an arithmetic number, because the mean of its divisors is an integer number (3355489718).

Almost surely, 2^20122120191 is an apocalyptic number.

20122120191 is a deficient number, since it is larger than the sum of its proper divisors (6721797553).

20122120191 is a wasteful number, since it uses less digits than its factorization.

20122120191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606041.

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

Adding to 20122120191 its reverse (19102122102), we get a palindrome (39224242293).

The spelling of 20122120191 in words is "twenty billion, one hundred twenty-two million, one hundred twenty thousand, one hundred ninety-one".