111211210012121 has 16 divisors (see below), whose sum is σ = 119400568898688. Its totient is φ = 103324217884800.

The previous prime is 111211210012081. The next prime is 111211210012141. The reversal of 111211210012121 is 121210012112111.

It is a cyclic number.

It is not a de Polignac number, because 111211210012121 - 2³⁰ = 111210136270297 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 111211210012121.

It is not an unprimeable number, because it can be changed into a prime (111211210012141) 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, 259551170 + ... + 259979291.

It is an arithmetic number, because the mean of its divisors is an integer number (7462535556168).

Almost surely, 2^{111211210012121} is an apocalyptic number.

It is an amenable number.

111211210012121 is a deficient number, since it is larger than the sum of its proper divisors (8189358886567).

111211210012121 is a wasteful number, since it uses less digits than its factorization.

111211210012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519530752.

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

Adding to 111211210012121 its reverse (121210012112111), we get a palindrome (232421222124232).

The spelling of 111211210012121 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred ten million, twelve thousand, one hundred twenty-one".