1002221200020 has 96 divisors (see below), whose sum is σ = 2883504895488. Its totient is φ = 259905687552.

The previous prime is 1002221200003. The next prime is 1002221200021. The reversal of 1002221200020 is 200021222001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1002221199969 and 1002221200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002221200021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4365829 + ... + 4589651.

It is an arithmetic number, because the mean of its divisors is an integer number (30036509328).

Almost surely, 2^{1002221200020} is an apocalyptic number.

1002221200020 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 1002221200020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441752447744).

1002221200020 is an abundant number, since it is smaller than the sum of its proper divisors (1881283695468).

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

1002221200020 is a wasteful number, since it uses less digits than its factorization.

1002221200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225889 (or 225887 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1002221200020 its reverse (200021222001), we get a palindrome (1202242422021).

The spelling of 1002221200020 in words is "one trillion, two billion, two hundred twenty-one million, two hundred thousand, twenty".