201021120191 has 8 divisors (see below), whose sum is σ = 206038488768. Its totient is φ = 196009200000.

The previous prime is 201021120149. The next prime is 201021120203. The reversal of 201021120191 is 191021120102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021120191 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 (201021120691) 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, 1287335 + ... + 1435016.

It is an arithmetic number, because the mean of its divisors is an integer number (25754811096).

Almost surely, 2^201021120191 is an apocalyptic number.

201021120191 is a deficient number, since it is larger than the sum of its proper divisors (5017368577).

201021120191 is a wasteful number, since it uses less digits than its factorization.

201021120191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724193.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 201021120191 its reverse (191021120102), we get a palindrome (392042240293).

The spelling of 201021120191 in words is "two hundred one billion, twenty-one million, one hundred twenty thousand, one hundred ninety-one".