111121222210221 has 8 divisors (see below), whose sum is σ = 148240987751584. Its totient is φ = 74041135737840.

The previous prime is 111121222210211. The next prime is 111121222210231. The reversal of 111121222210221 is 122012222121111.

It is an interprime number because it is at equal distance from previous prime (111121222210211) and next prime (111121222210231).

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

It is not a de Polignac number, because 111121222210221 - 2¹⁵ = 111121222177453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121222210211) 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, 9919760710 + ... + 9919771911.

It is an arithmetic number, because the mean of its divisors is an integer number (18530123468948).

Almost surely, 2^{111121222210221} is an apocalyptic number.

It is an amenable number.

111121222210221 is a deficient number, since it is larger than the sum of its proper divisors (37119765541363).

111121222210221 is a wasteful number, since it uses less digits than its factorization.

111121222210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19839534491.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111121222210221 its reverse (122012222121111), we get a palindrome (233133444331332).

The spelling of 111121222210221 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty-one".