111101222121 has 16 divisors (see below), whose sum is σ = 157046312448. Its totient is φ = 69740956800.

The previous prime is 111101222087. The next prime is 111101222123. The reversal of 111101222121 is 121222101111.

It is a happy number.

It is not a de Polignac number, because 111101222121 - 2¹³ = 111101213929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111101222121.

It is not an unprimeable number, because it can be changed into a prime (111101222123) 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, 16140300 + ... + 16147181.

It is an arithmetic number, because the mean of its divisors is an integer number (9815394528).

Almost surely, 2^111101222121 is an apocalyptic number.

It is an amenable number.

111101222121 is a deficient number, since it is larger than the sum of its proper divisors (45945090327).

111101222121 is a wasteful number, since it uses less digits than its factorization.

111101222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32287552.

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

Adding to 111101222121 its reverse (121222101111), we get a palindrome (232323323232).

The spelling of 111101222121 in words is "one hundred eleven billion, one hundred one million, two hundred twenty-two thousand, one hundred twenty-one".