121111210121 has 8 divisors (see below), whose sum is σ = 132127632000. Its totient is φ = 110095840240.

The previous prime is 121111210069. The next prime is 121111210133. The reversal of 121111210121 is 121012111121.

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

It is a cyclic number.

It is not a de Polignac number, because 121111210121 - 2¹⁴ = 121111193737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111210096 and 121111210105.

It is not an unprimeable number, because it can be changed into a prime (121111210151) 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, 11846 + ... + 492303.

It is an arithmetic number, because the mean of its divisors is an integer number (16515954000).

Almost surely, 2^121111210121 is an apocalyptic number.

121111210121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121111210121 is a deficient number, since it is larger than the sum of its proper divisors (11016421879).

121111210121 is a wasteful number, since it uses less digits than its factorization.

121111210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525999.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121111210121 its reverse (121012111121), we get a palindrome (242123321242).

The spelling of 121111210121 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-one".