1221121120222 has 4 divisors (see below), whose sum is σ = 1831681680336. Its totient is φ = 610560560110.

The previous prime is 1221121120211. The next prime is 1221121120223. The reversal of 1221121120222 is 2220211211221.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1221121120222² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221121120222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221121120223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305280280054 + ... + 305280280057.

It is an arithmetic number, because the mean of its divisors is an integer number (457920420084).

Almost surely, 2^{1221121120222} is an apocalyptic number.

1221121120222 is a deficient number, since it is larger than the sum of its proper divisors (610560560114).

1221121120222 is an equidigital number, since it uses as much as digits as its factorization.

1221121120222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610560560113.

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

Adding to 1221121120222 its reverse (2220211211221), we get a palindrome (3441332331443).

Subtracting 1221121120222 from its reverse (2220211211221), we obtain a palindrome (999090090999).

The spelling of 1221121120222 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty-two".