121100111212121 has 32 divisors (see below), whose sum is σ = 126272044302336. Its totient is φ = 116013296520000.

The previous prime is 121100111212081. The next prime is 121100111212187. The reversal of 121100111212121 is 121212111001121.

It is a cyclic number.

It is not a de Polignac number, because 121100111212121 - 2⁴⁶ = 50731367034457 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 121100111212121.

It is not an unprimeable number, because it can be changed into a prime (121100111212021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1769322926 + ... + 1769391368.

It is an arithmetic number, because the mean of its divisors is an integer number (3946001384448).

Almost surely, 2^{121100111212121} is an apocalyptic number.

It is an amenable number.

121100111212121 is a deficient number, since it is larger than the sum of its proper divisors (5171933090215).

121100111212121 is a wasteful number, since it uses less digits than its factorization.

121100111212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69933.

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

Adding to 121100111212121 its reverse (121212111001121), we get a palindrome (242312222213242).

The spelling of 121100111212121 in words is "one hundred twenty-one trillion, one hundred billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".