121220221121 has 8 divisors (see below), whose sum is σ = 123343892640. Its totient is φ = 119098852768.

The previous prime is 121220221091. The next prime is 121220221147. The reversal of 121220221121 is 121122022121.

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 121220221121 - 2¹⁰ = 121220220097 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 121220221121.

It is not an unprimeable number, because it can be changed into a prime (121220221021) 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, 469436 + ... + 680301.

It is an arithmetic number, because the mean of its divisors is an integer number (15417986580).

Almost surely, 2^121220221121 is an apocalyptic number.

It is an amenable number.

121220221121 is a deficient number, since it is larger than the sum of its proper divisors (2123671519).

121220221121 is a wasteful number, since it uses less digits than its factorization.

121220221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151583.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121220221121 its reverse (121122022121), we get a palindrome (242342243242).

The spelling of 121220221121 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".