1220222200121 has 4 divisors (see below), whose sum is σ = 1284444421200. Its totient is φ = 1155999979044.

The previous prime is 1220222200079. The next prime is 1220222200123. The reversal of 1220222200121 is 1210022220221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220222200121 - 2²² = 1220218005817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220222200121.

It is not an unprimeable number, because it can be changed into a prime (1220222200123) 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 3 ways as a sum of consecutive naturals, for example, 32111110511 + ... + 32111110548.

It is an arithmetic number, because the mean of its divisors is an integer number (321111105300).

Almost surely, 2^{1220222200121} is an apocalyptic number.

It is an amenable number.

1220222200121 is a deficient number, since it is larger than the sum of its proper divisors (64222221079).

1220222200121 is an equidigital number, since it uses as much as digits as its factorization.

1220222200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64222221078.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220222200121 its reverse (1210022220221), we get a palindrome (2430244420342).

The spelling of 1220222200121 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred thousand, one hundred twenty-one".