20121022191 has 8 divisors (see below), whose sum is σ = 26927763120. Its totient is φ = 13364148032.

The previous prime is 20121022171. The next prime is 20121022213. The reversal of 20121022191 is 19122012102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121022191 - 2¹⁸ = 20120760047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121022111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12465750 + ... + 12467363.

It is an arithmetic number, because the mean of its divisors is an integer number (3365970390).

Almost surely, 2^20121022191 is an apocalyptic number.

20121022191 is a deficient number, since it is larger than the sum of its proper divisors (6806740929).

20121022191 is a wasteful number, since it uses less digits than its factorization.

20121022191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24933385.

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

Adding to 20121022191 its reverse (19122012102), we get a palindrome (39243034293).

The spelling of 20121022191 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred ninety-one".