20220021191 has 4 divisors (see below), whose sum is σ = 20226721800. Its totient is φ = 20213320584.

The previous prime is 20220021167. The next prime is 20220021271. The reversal of 20220021191 is 19112002202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220021191 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 (20220021091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3345776 + ... + 3351813.

It is an arithmetic number, because the mean of its divisors is an integer number (5056680450).

Almost surely, 2^20220021191 is an apocalyptic number.

20220021191 is a deficient number, since it is larger than the sum of its proper divisors (6700609).

20220021191 is an equidigital number, since it uses as much as digits as its factorization.

20220021191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700608.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20220021191 its reverse (19112002202), we get a palindrome (39332023393).

The spelling of 20220021191 in words is "twenty billion, two hundred twenty million, twenty-one thousand, one hundred ninety-one".