10001221002020 has 48 divisors (see below), whose sum is σ = 21923334236160. Its totient is φ = 3825224489856.

The previous prime is 10001221001999. The next prime is 10001221002053. The reversal of 10001221002020 is 2020012210001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 10001221001992 and 10001221002010.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2451587 + ... + 5100266.

It is an arithmetic number, because the mean of its divisors is an integer number (456736129920).

Almost surely, 2^{10001221002020} is an apocalyptic number.

10001221002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001221002020 is an abundant number, since it is smaller than the sum of its proper divisors (11922113234140).

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

10001221002020 is a wasteful number, since it uses less digits than its factorization.

10001221002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7554764 (or 7554762 counting only the distinct ones).

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

Adding to 10001221002020 its reverse (2020012210001), we get a palindrome (12021233212021).

The spelling of 10001221002020 in words is "ten trillion, one billion, two hundred twenty-one million, two thousand, twenty".