121121120202221 has 4 divisors (see below), whose sum is σ = 121121191097244. Its totient is φ = 121121049307200.

The previous prime is 121121120202193. The next prime is 121121120202233. The reversal of 121121120202221 is 122202021121121.

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 31592830562500 + 89528289639721 = 5620750^2 + 9461939^2 .

It is a cyclic number.

It is not a de Polignac number, because 121121120202221 - 2¹⁴ = 121121120185837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121121120202193 and 121121120202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121120205221) 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, 32819900 + ... + 36323381.

It is an arithmetic number, because the mean of its divisors is an integer number (30280297774311).

Almost surely, 2^{121121120202221} is an apocalyptic number.

It is an amenable number.

121121120202221 is a deficient number, since it is larger than the sum of its proper divisors (70895023).

121121120202221 is an equidigital number, since it uses as much as digits as its factorization.

121121120202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70895022.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121121120202221 its reverse (122202021121121), we get a palindrome (243323141323342).

The spelling of 121121120202221 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, two hundred two thousand, two hundred twenty-one".