221201121210111 has 48 divisors (see below), whose sum is σ = 378719400294144. Its totient is φ = 126388074968064.

The previous prime is 221201121210109. The next prime is 221201121210133. The reversal of 221201121210111 is 111012121102122.

It is a happy number.

221201121210111 is a `hidden beast` number, since 2 + 21 + 201 + 121 + 210 + 111 = 666.

It is not a de Polignac number, because 221201121210111 - 2¹ = 221201121210109 is a prime.

It is a super-2 number, since 2×221201121210111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201121215111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10665151 + ... + 23582783.

It is an arithmetic number, because the mean of its divisors is an integer number (7889987506128).

Almost surely, 2^{221201121210111} is an apocalyptic number.

221201121210111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221201121210111 is a deficient number, since it is larger than the sum of its proper divisors (157518279084033).

221201121210111 is a wasteful number, since it uses less digits than its factorization.

221201121210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12927722 (or 12927710 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221201121210111 its reverse (111012121102122), we get a palindrome (332213242312233).

The spelling of 221201121210111 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred twenty-one million, two hundred ten thousand, one hundred eleven".