1001222100020 has 96 divisors (see below), whose sum is σ = 2162605011840. Its totient is φ = 389135093760.

The previous prime is 1001222099993. The next prime is 1001222100037. The reversal of 1001222100020 is 200012221001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1001222099974 and 1001222100010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394335911 + ... + 394338449.

It is an arithmetic number, because the mean of its divisors is an integer number (22527135540).

Almost surely, 2^{1001222100020} is an apocalyptic number.

1001222100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001222100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081302505920).

1001222100020 is an abundant number, since it is smaller than the sum of its proper divisors (1161382911820).

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

1001222100020 is a wasteful number, since it uses less digits than its factorization.

1001222100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353 (or 4351 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1001222100020 its reverse (200012221001), we get a palindrome (1201234321021).

The spelling of 1001222100020 in words is "one trillion, one billion, two hundred twenty-two million, one hundred thousand, twenty".