201221101011011 has 32 divisors (see below), whose sum is σ = 209355060739968. Its totient is φ = 193296683888640.

The previous prime is 201221101011001. The next prime is 201221101011023. The reversal of 201221101011011 is 110110101122102.

It is a cyclic number.

It is not a de Polignac number, because 201221101011011 - 2¹⁰ = 201221101009987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221101011001) 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, 7254595535 + ... + 7254623271.

It is an arithmetic number, because the mean of its divisors is an integer number (6542345648124).

Almost surely, 2^{201221101011011} is an apocalyptic number.

201221101011011 is a deficient number, since it is larger than the sum of its proper divisors (8133959728957).

201221101011011 is a wasteful number, since it uses less digits than its factorization.

201221101011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43791.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 201221101011011 its reverse (110110101122102), we get a palindrome (311331202133113).

The spelling of 201221101011011 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred one million, eleven thousand, eleven".