1221002120022 has 32 divisors (see below), whose sum is σ = 2521062144000. Its totient is φ = 393827343360.

The previous prime is 1221002120021. The next prime is 1221002120059. The reversal of 1221002120022 is 2200212001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221002119983 and 1221002120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002120021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309078 + ... + 2038550.

It is an arithmetic number, because the mean of its divisors is an integer number (78783192000).

Almost surely, 2^{1221002120022} is an apocalyptic number.

1221002120022 is an abundant number, since it is smaller than the sum of its proper divisors (1300060023978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221002120022 is a wasteful number, since it uses less digits than its factorization.

1221002120022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738508.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221002120022 its reverse (2200212001221), we get a palindrome (3421214121243).

The spelling of 1221002120022 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty thousand, twenty-two".