111212122200121 has 4 divisors (see below), whose sum is σ = 111591685757412. Its totient is φ = 110832558642832.

The previous prime is 111212122200119. The next prime is 111212122200143. The reversal of 111212122200121 is 121002221212111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105202171889721 + 6009950310400 = 10256811^2 + 2451520^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212122200121 - 2¹ = 111212122200119 is a prime.

It is a super-2 number, since 2×111212122200121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111212122203121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189781778206 + ... + 189781778791.

It is an arithmetic number, because the mean of its divisors is an integer number (27897921439353).

Almost surely, 2^{111212122200121} is an apocalyptic number.

It is an amenable number.

111212122200121 is a deficient number, since it is larger than the sum of its proper divisors (379563557291).

111212122200121 is an equidigital number, since it uses as much as digits as its factorization.

111212122200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379563557290.

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

Adding to 111212122200121 its reverse (121002221212111), we get a palindrome (232214343412232).

The spelling of 111212122200121 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-two million, two hundred thousand, one hundred twenty-one".