201221323011 has 32 divisors (see below), whose sum is σ = 302436080640. Its totient is φ = 132200510400.

The previous prime is 201221323007. The next prime is 201221323087. The reversal of 201221323011 is 110323122102.

201221323011 is a `hidden beast` number, since 201 + 221 + 3 + 230 + 11 = 666.

It is not a de Polignac number, because 201221323011 - 2² = 201221323007 is a prime.

It is a super-2 number, since 2×201221323011² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201221323001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4623231 + ... + 4666551.

It is an arithmetic number, because the mean of its divisors is an integer number (9451127520).

Almost surely, 2^201221323011 is an apocalyptic number.

201221323011 is a deficient number, since it is larger than the sum of its proper divisors (101214757629).

201221323011 is a wasteful number, since it uses less digits than its factorization.

201221323011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45824 (or 45818 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 201221323011 its reverse (110323122102), we get a palindrome (311544445113).

The spelling of 201221323011 in words is "two hundred one billion, two hundred twenty-one million, three hundred twenty-three thousand, eleven".