1021221000100 has 144 divisors (see below), whose sum is σ = 2585915740800. Its totient is φ = 349915977600.

The previous prime is 1021221000097. The next prime is 1021221000133. The reversal of 1021221000100 is 10001221201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61285770 + ... + 61302430.

It is an arithmetic number, because the mean of its divisors is an integer number (17957748200).

Almost surely, 2^{1021221000100} is an apocalyptic number.

1021221000100 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 1021221000100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292957870400).

1021221000100 is an abundant number, since it is smaller than the sum of its proper divisors (1564694740700).

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

1021221000100 is a wasteful number, since it uses less digits than its factorization.

1021221000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18483 (or 18462 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021221000100 its reverse (10001221201), we get a palindrome (1031222221301).

The spelling of 1021221000100 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred", and thus it is an aban number.