201221221101 has 16 divisors (see below), whose sum is σ = 275852951808. Its totient is φ = 130392633600.

The previous prime is 201221221073. The next prime is 201221221111. The reversal of 201221221101 is 101122122102.

It is not a de Polignac number, because 201221221101 - 2⁷ = 201221220973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221221111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2985016 + ... + 3051681.

It is an arithmetic number, because the mean of its divisors is an integer number (17240809488).

Almost surely, 2^201221221101 is an apocalyptic number.

It is an amenable number.

201221221101 is a deficient number, since it is larger than the sum of its proper divisors (74631730707).

201221221101 is a wasteful number, since it uses less digits than its factorization.

201221221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6037012.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201221221101 its reverse (101122122102), we get a palindrome (302343343203).

The spelling of 201221221101 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred one".