201221002011 has 8 divisors (see below), whose sum is σ = 272692942864. Its totient is φ = 131948197920.

The previous prime is 201221002009. The next prime is 201221002013. The reversal of 201221002011 is 110200122102.

It is an interprime number because it is at equal distance from previous prime (201221002009) and next prime (201221002013).

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

It is not a de Polignac number, because 201221002011 - 2¹ = 201221002009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221002013) 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, 549783976 + ... + 549784341.

It is an arithmetic number, because the mean of its divisors is an integer number (34086617858).

Almost surely, 2^201221002011 is an apocalyptic number.

201221002011 is a deficient number, since it is larger than the sum of its proper divisors (71471940853).

201221002011 is a wasteful number, since it uses less digits than its factorization.

201221002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099568381.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201221002011 its reverse (110200122102), we get a palindrome (311421124113).

The spelling of 201221002011 in words is "two hundred one billion, two hundred twenty-one million, two thousand, eleven".