121231213121 has 8 divisors (see below), whose sum is σ = 121816128000. Its totient is φ = 120646667232.

The previous prime is 121231213109. The next prime is 121231213189. The reversal of 121231213121 is 121312132121.

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 121231213121 - 2¹⁰ = 121231212097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121231213093 and 121231213102.

It is not an unprimeable number, because it can be changed into a prime (121231213321) 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, 578141 + ... + 759413.

It is an arithmetic number, because the mean of its divisors is an integer number (15227016000).

Almost surely, 2^121231213121 is an apocalyptic number.

It is an amenable number.

121231213121 is a deficient number, since it is larger than the sum of its proper divisors (584914879).

121231213121 is a wasteful number, since it uses less digits than its factorization.

121231213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184495.

The product of its digits is 144, while the sum is 20.

Adding to 121231213121 its reverse (121312132121), we get a palindrome (242543345242).

The spelling of 121231213121 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred thirteen thousand, one hundred twenty-one".