1000100001220 has 12 divisors (see below), whose sum is σ = 2100210002604. Its totient is φ = 400040000480.

The previous prime is 1000100001169. The next prime is 1000100001223. The reversal of 1000100001220 is 221000010001.

It can be written as a sum of positive squares in 2 ways, for example, as 649787536836 + 350312464384 = 806094^2 + 591872^2 .

It is not an unprimeable number, because it can be changed into a prime (1000100001223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25002500011 + ... + 25002500050.

It is an arithmetic number, because the mean of its divisors is an integer number (175017500217).

Almost surely, 2^{1000100001220} is an apocalyptic number.

1000100001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000100001220 is an abundant number, since it is smaller than the sum of its proper divisors (1100110001384).

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

1000100001220 is a wasteful number, since it uses less digits than its factorization.

1000100001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50005000070 (or 50005000068 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1000100001220 its reverse (221000010001), we get a palindrome (1221100011221).

The spelling of 1000100001220 in words is "one trillion, one hundred million, one thousand, two hundred twenty".