121222202221 has 4 divisors (see below), whose sum is σ = 121223832444. Its totient is φ = 121220572000.

The previous prime is 121222202207. The next prime is 121222202261. The reversal of 121222202221 is 122202222121.

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 108484596900 + 12737605321 = 329370^2 + 112861^2 .

It is a cyclic number.

It is not a de Polignac number, because 121222202221 - 2¹⁷ = 121222071149 is a prime.

It is a super-2 number, since 2×121222202221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222202261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697960 + ... + 854161.

It is an arithmetic number, because the mean of its divisors is an integer number (30305958111).

Almost surely, 2^121222202221 is an apocalyptic number.

It is an amenable number.

121222202221 is a deficient number, since it is larger than the sum of its proper divisors (1630223).

121222202221 is an equidigital number, since it uses as much as digits as its factorization.

121222202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630222.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 121222202221 its reverse (122202222121), we get a palindrome (243424424342).

The spelling of 121222202221 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred two thousand, two hundred twenty-one".