111212121001211 has 8 divisors (see below), whose sum is σ = 113798603695920. Its totient is φ = 108625645320192.

The previous prime is 111212121001171. The next prime is 111212121001213. The reversal of 111212121001211 is 112100121212111.

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

It is not a de Polignac number, because 111212121001211 - 2²⁶ = 111212053892347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111212121001211.

It is not an unprimeable number, because it can be changed into a prime (111212121001213) 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, 44129051 + ... + 46581083.

It is an arithmetic number, because the mean of its divisors is an integer number (14224825461990).

Almost surely, 2^{111212121001211} is an apocalyptic number.

111212121001211 is a deficient number, since it is larger than the sum of its proper divisors (2586482694709).

111212121001211 is a wasteful number, since it uses less digits than its factorization.

111212121001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506845.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111212121001211 its reverse (112100121212111), we get a palindrome (223312242213322).

The spelling of 111212121001211 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, one thousand, two hundred eleven".