100421787536521 has 12 divisors (see below), whose sum is σ = 110426984640000. Its totient is φ = 91254479448440.

The previous prime is 100421787536519. The next prime is 100421787536591. The reversal of 100421787536521 is 125635787124001.

It is not a de Polignac number, because 100421787536521 - 2¹ = 100421787536519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100421787536591) by changing a digit.

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, 172684321 + ... + 173264878.

It is an arithmetic number, because the mean of its divisors is an integer number (9202248720000).

Almost surely, 2^{100421787536521} is an apocalyptic number.

100421787536521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100421787536521 is a deficient number, since it is larger than the sum of its proper divisors (10005197103479).

100421787536521 is a wasteful number, since it uses less digits than its factorization.

100421787536521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345951620 (or 345951609 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 100421787536521 in words is "one hundred trillion, four hundred twenty-one billion, seven hundred eighty-seven million, five hundred thirty-six thousand, five hundred twenty-one".