10001221100020 has 24 divisors (see below), whose sum is σ = 21044318932224. Its totient is φ = 3992535178656.

The previous prime is 10001221099981. The next prime is 10001221100029. The reversal of 10001221100020 is 2000112210001.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001221100029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497068524 + ... + 497088643.

It is an arithmetic number, because the mean of its divisors is an integer number (876846622176).

Almost surely, 2^{10001221100020} is an apocalyptic number.

10001221100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001221100020 is an abundant number, since it is smaller than the sum of its proper divisors (11043097832204).

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

10001221100020 is a wasteful number, since it uses less digits than its factorization.

10001221100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994157679 (or 994157677 counting only the distinct ones).

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

Adding to 10001221100020 its reverse (2000112210001), we get a palindrome (12001333310021).

The spelling of 10001221100020 in words is "ten trillion, one billion, two hundred twenty-one million, one hundred thousand, twenty".