21221012000100 has 72 divisors (see below), whose sum is σ = 66981230614368. Its totient is φ = 5144487756800.

The previous prime is 21221012000059. The next prime is 21221012000119. The reversal of 21221012000100 is 100021012212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 23 ways as a sum of consecutive naturals, for example, 3215301549 + ... + 3215308148.

It is an arithmetic number, because the mean of its divisors is an integer number (930294869644).

Almost surely, 2^{21221012000100} is an apocalyptic number.

21221012000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221012000100 is an abundant number, since it is smaller than the sum of its proper divisors (45760218614268).

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

21221012000100 is a wasteful number, since it uses less digits than its factorization.

21221012000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430609725 (or 6430609718 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21221012000100 its reverse (100021012212), we get a palindrome (21321033012312).

The spelling of 21221012000100 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred", and thus it is an aban number.