121220221200121 has 4 divisors (see below), whose sum is σ = 121563621260532. Its totient is φ = 120876821139712.

The previous prime is 121220221200101. The next prime is 121220221200137. The reversal of 121220221200121 is 121002122022121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70798576527721 + 50421644672400 = 8414189^2 + 7100820^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220221200121 - 2¹³ = 121220221191929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220221200101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171700029676 + ... + 171700030381.

It is an arithmetic number, because the mean of its divisors is an integer number (30390905315133).

Almost surely, 2^{121220221200121} is an apocalyptic number.

It is an amenable number.

121220221200121 is a deficient number, since it is larger than the sum of its proper divisors (343400060411).

121220221200121 is an equidigital number, since it uses as much as digits as its factorization.

121220221200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343400060410.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121220221200121 its reverse (121002122022121), we get a palindrome (242222343222242).

The spelling of 121220221200121 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".