10000021221020 has 24 divisors (see below), whose sum is σ = 21000124776624. Its totient is φ = 3999993209856.

The previous prime is 10000021221019. The next prime is 10000021221131. The reversal of 10000021221020 is 2012212000001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 10000021220992 and 10000021221010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5464727 + ... + 7061393.

It is an arithmetic number, because the mean of its divisors is an integer number (875005199026).

Almost surely, 2^{10000021221020} is an apocalyptic number.

10000021221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10000021221020 is an abundant number, since it is smaller than the sum of its proper divisors (11000103555604).

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

10000021221020 is a wasteful number, since it uses less digits than its factorization.

10000021221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909829 (or 1909827 counting only the distinct ones).

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

Adding to 10000021221020 its reverse (2012212000001), we get a palindrome (12012233221021).

The spelling of 10000021221020 in words is "ten trillion, twenty-one million, two hundred twenty-one thousand, twenty".