19210091820021 has 32 divisors (see below), whose sum is σ = 29378531635200. Its totient is φ = 12393147219120.

The previous prime is 19210091819999. The next prime is 19210091820103. The reversal of 19210091820021 is 12002819001291.

It is not a de Polignac number, because 19210091820021 - 2³⁰ = 19209018078197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19210091820721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22878810 + ... + 23703588.

It is an arithmetic number, because the mean of its divisors is an integer number (918079113600).

Almost surely, 2^{19210091820021} is an apocalyptic number.

It is an amenable number.

19210091820021 is a deficient number, since it is larger than the sum of its proper divisors (10168439815179).

19210091820021 is a wasteful number, since it uses less digits than its factorization.

19210091820021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852646 (or 852640 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The spelling of 19210091820021 in words is "nineteen trillion, two hundred ten billion, ninety-one million, eight hundred twenty thousand, twenty-one".