121001022221221 has 4 divisors (see below), whose sum is σ = 121001166307692. Its totient is φ = 121000878134752.

The previous prime is 121001022221207. The next prime is 121001022221267. The reversal of 121001022221221 is 122122220100121.

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 107125501521025 + 13875520700196 = 10350145^2 + 3724986^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001022221221 - 2²¹ = 121001020124069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121071022221221) 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, 70776136 + ... + 72465601.

It is an arithmetic number, because the mean of its divisors is an integer number (30250291576923).

Almost surely, 2^{121001022221221} is an apocalyptic number.

It is an amenable number.

121001022221221 is a deficient number, since it is larger than the sum of its proper divisors (144086471).

121001022221221 is an equidigital number, since it uses as much as digits as its factorization.

121001022221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144086470.

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

Adding to 121001022221221 its reverse (122122220100121), we get a palindrome (243123242321342).

The spelling of 121001022221221 in words is "one hundred twenty-one trillion, one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".