111001200121221 has 16 divisors (see below), whose sum is σ = 148982709590400. Its totient is φ = 73510251724800.

The previous prime is 111001200121153. The next prime is 111001200121247. The reversal of 111001200121221 is 122121002100111.

It is a happy number.

It is not a de Polignac number, because 111001200121221 - 2¹³ = 111001200113029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111001200121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001200121121) 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, 77657605 + ... + 79074053.

It is an arithmetic number, because the mean of its divisors is an integer number (9311419349400).

Almost surely, 2^{111001200121221} is an apocalyptic number.

It is an amenable number.

111001200121221 is a deficient number, since it is larger than the sum of its proper divisors (37981509469179).

111001200121221 is a wasteful number, since it uses less digits than its factorization.

111001200121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589596.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111001200121221 its reverse (122121002100111), we get a palindrome (233122202221332).

The spelling of 111001200121221 in words is "one hundred eleven trillion, one billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".