121221321123221 has 8 divisors (see below), whose sum is σ = 132248825517600. Its totient is φ = 110195047444240.

The previous prime is 121221321123179. The next prime is 121221321123223. The reversal of 121221321123221 is 122321123122121.

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

It is not a de Polignac number, because 121221321123221 - 2³⁴ = 121204141254037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221321123223) 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, 307472891 + ... + 307866888.

It is an arithmetic number, because the mean of its divisors is an integer number (16531103189700).

Almost surely, 2^{121221321123221} is an apocalyptic number.

121221321123221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221321123221 is a deficient number, since it is larger than the sum of its proper divisors (11027504394379).

121221321123221 is a wasteful number, since it uses less digits than its factorization.

121221321123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615357699.

The product of its digits is 1152, while the sum is 26.

Adding to 121221321123221 its reverse (122321123122121), we get a palindrome (243542444245342).

The spelling of 121221321123221 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".