20211021000100 has 36 divisors (see below), whose sum is σ = 50123332081984. Its totient is φ = 6929492914080.

The previous prime is 20211021000077. The next prime is 20211021000167. The reversal of 20211021000100 is 100012011202.

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

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 11 ways as a sum of consecutive naturals, for example, 14436442872 + ... + 14436444271.

Almost surely, 2^{20211021000100} is an apocalyptic number.

20211021000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211021000100 is an abundant number, since it is smaller than the sum of its proper divisors (29912311081884).

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

20211021000100 is a wasteful number, since it uses less digits than its factorization.

20211021000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28872887164 (or 28872887157 counting only the distinct ones).

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

Adding to 20211021000100 its reverse (100012011202), we get a palindrome (20311033011302).

The spelling of 20211021000100 in words is "twenty trillion, two hundred eleven billion, twenty-one million, one hundred", and thus it is an aban number.