121210121221 has 8 divisors (see below), whose sum is σ = 138962845440. Its totient is φ = 103566645168.

The previous prime is 121210121189. The next prime is 121210121239. The reversal of 121210121221 is 122121012121.

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

It is not a de Polignac number, because 121210121221 - 2⁵ = 121210121189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121210121195 and 121210121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210121521) 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, 27309661 + ... + 27314098.

It is an arithmetic number, because the mean of its divisors is an integer number (17370355680).

Almost surely, 2^121210121221 is an apocalyptic number.

It is an amenable number.

121210121221 is a deficient number, since it is larger than the sum of its proper divisors (17752724219).

121210121221 is an equidigital number, since it uses as much as digits as its factorization.

121210121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54624083.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121210121221 its reverse (122121012121), we get a palindrome (243331133342).

The spelling of 121210121221 in words is "one hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".