1221002020222 has 16 divisors (see below), whose sum is σ = 1832536585152. Its totient is φ = 610156586880.

The previous prime is 1221002020177. The next prime is 1221002020223. The reversal of 1221002020222 is 2220202001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221002020196 and 1221002020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002020223) 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 7 ways as a sum of consecutive naturals, for example, 31197738 + ... + 31236850.

It is an arithmetic number, because the mean of its divisors is an integer number (114533536572).

Almost surely, 2^{1221002020222} is an apocalyptic number.

1221002020222 is a deficient number, since it is larger than the sum of its proper divisors (611534564930).

1221002020222 is a wasteful number, since it uses less digits than its factorization.

1221002020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47523.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 1221002020222 its reverse (2220202001221), we get a palindrome (3441204021443).

The spelling of 1221002020222 in words is "one trillion, two hundred twenty-one billion, two million, twenty thousand, two hundred twenty-two".