121222223221 has 32 divisors (see below), whose sum is σ = 142579802880. Its totient is φ = 101830732800.

The previous prime is 121222223219. The next prime is 121222223237. The reversal of 121222223221 is 122322222121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121222223221 - 2¹ = 121222223219 is a prime.

It is a super-2 number, since 2×121222223221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121222223192 and 121222223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222223321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6344160 + ... + 6363238.

It is an arithmetic number, because the mean of its divisors is an integer number (4455618840).

Almost surely, 2^121222223221 is an apocalyptic number.

121222223221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121222223221 is a deficient number, since it is larger than the sum of its proper divisors (21357579659).

121222223221 is a wasteful number, since it uses less digits than its factorization.

121222223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19725.

The product of its digits is 768, while the sum is 22.

Adding to 121222223221 its reverse (122322222121), we get a palindrome (243544445342).

It can be divided in two parts, 121222 and 223221, that added together give a palindrome (344443).

The spelling of 121222223221 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".