1220222002121 has 12 divisors (see below), whose sum is σ = 1276511597508. Its totient is φ = 1166318090784.

The previous prime is 1220222002117. The next prime is 1220222002123. The reversal of 1220222002121 is 1212002220221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1158884545225 + 61337456896 = 1076515^2 + 247664^2 .

It is not a de Polignac number, because 1220222002121 - 2² = 1220222002117 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 1220222002121.

It is not an unprimeable number, because it can be changed into a prime (1220222002123) 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 11 ways as a sum of consecutive naturals, for example, 113690 + ... + 1566323.

It is an arithmetic number, because the mean of its divisors is an integer number (106375966459).

Almost surely, 2^{1220222002121} is an apocalyptic number.

It is an amenable number.

1220222002121 is a deficient number, since it is larger than the sum of its proper divisors (56289595387).

1220222002121 is a wasteful number, since it uses less digits than its factorization.

1220222002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681432 (or 1681409 counting only the distinct ones).

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

Adding to 1220222002121 its reverse (1212002220221), we get a palindrome (2432224222342).

The spelling of 1220222002121 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two thousand, one hundred twenty-one".