111121022201221 has 8 divisors (see below), whose sum is σ = 114953517865080. Its totient is φ = 107288575622592.

The previous prime is 111121022201209. The next prime is 111121022201237. The reversal of 111121022201221 is 122102220121111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 703273440996 + 110417748760225 = 838614^2 + 10507985^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111121022201221 - 2⁹ = 111121022200709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121022201201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7635870 + ... + 16749583.

It is an arithmetic number, because the mean of its divisors is an integer number (14369189733135).

Almost surely, 2^{111121022201221} is an apocalyptic number.

It is an amenable number.

111121022201221 is a deficient number, since it is larger than the sum of its proper divisors (3832495663859).

111121022201221 is a wasteful number, since it uses less digits than its factorization.

111121022201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24542615.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111121022201221 its reverse (122102220121111), we get a palindrome (233223242322332).

The spelling of 111121022201221 in words is "one hundred eleven trillion, one hundred twenty-one billion, twenty-two million, two hundred one thousand, two hundred twenty-one".