121222211221 has 16 divisors (see below), whose sum is σ = 127269172800. Its totient is φ = 115312579200.

The previous prime is 121222211167. The next prime is 121222211281. The reversal of 121222211221 is 122112222121.

It is a cyclic number.

It is not a de Polignac number, because 121222211221 - 2¹⁵ = 121222178453 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 (121222211281) 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 15 ways as a sum of consecutive naturals, for example, 413281 + ... + 642841.

It is an arithmetic number, because the mean of its divisors is an integer number (7954323300).

Almost surely, 2^121222211221 is an apocalyptic number.

It is an amenable number.

121222211221 is a deficient number, since it is larger than the sum of its proper divisors (6046961579).

121222211221 is a wasteful number, since it uses less digits than its factorization.

121222211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229860.

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

Adding to 121222211221 its reverse (122112222121), we get a palindrome (243334433342).

The spelling of 121222211221 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".